2003 Chevrolet Impala Catalytic Converters

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Keep Your 2003 Chevrolet Impala in Top Shape with Quality Catalytic Converters

Whether you’re repairing or upgrading your Catalytic Converter, using high-quality parts is key to keeping your 2003 Chevrolet Impala looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Catalytic Converter Gaskets and Catalytic Converters. Whether you’re replacing a damaged part or enhancing your truck’s style and protection, you’ll find exactly what you need to get the job done right.

Top-Rated Catalytic Converters from Trusted Brands

Looking for a reliable Catalytic Converter? We’ve got you covered with options from brands you know and trust like Walker and MagnaFlow. For example, Walker Catalytic Converters start at just $9.89 with an average 4.2 star rating. MagnaFlow offer similar pricing and quality, backed by strong customer feedback. With over 249 reviews and a solid 4.0 star average, you can shop with confidence knowing other Chevrolet Impala owners approve.

Competitive Prices and Extensive Inventory

The average price for a 2003 Chevrolet Impala Catalytic Converter at Advance Auto Parts is around $348.85, with a range that starts at $5.79 and goes up to $1,310.00. With 19 options in stock from 3 trusted brands, finding the right fit is easy. Popular picks like Walker Exhaust Pipe Flange Gasket, 31605, MagnaFlow Hm Grade Federal / Epa Compliant Universal Catalytic Converter, 99306HM, and MagnaFlow Oem Grade Federal / Epa Compliant Universal Catalytic Converter, 51206 start at just $19.79 and offer a great balance of form and function.

Explore Related Parts

While you’re upgrading or replacing your Catalytic Converter, don’t forget to check out other key components like Exhaust Manifold and Headers and Exhaust Mufflers. At Advance Auto Parts, we’re here to help you keep your 2003 Chevrolet Impala in peak condition, inside and out.

Essential 2003 Chevrolet Impala Catalytic Converters

Walker – Walker CalCat CARB Direct Fit Catalytic Converter Overall Length 13.325 IN, 84355 (Part No.84355)

Walker CalCat CARB Direct Fit Catalytic Converter Overall Length 13.325 IN, 84355

from

$972.99
Designed, tested and validated for assured compliance to meet CARB standards, Walker CalCat direct-fit catalytic converters are available for OBDII (1996 and newer) and non-OBD (1995 and older) vehicles and delivers a precise OE-style fit. Walker CalCat catalytic converters are thoroughly tested to ensure they meet CARB performance requirements.
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Walker – Walker CalCat CARB Direct Fit Catalytic Converter Overall Length 38.325 IN, 84585 (Part No.84585)

Walker CalCat CARB Direct Fit Catalytic Converter Overall Length 38.325 IN, 84585

from

$1929.00
Designed, tested and validated for assured compliance to meet CARB standards, Walker CalCat direct-fit catalytic converters are available for OBDII (1996 and newer) and non-OBD (1995 and older) vehicles and delivers a precise OE-style fit. Walker CalCat catalytic converters are thoroughly tested to ensure they meet CARB performance requirements.
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MagnaFlow – MagnaFlow Oem Grade Federal / Epa Compliant Universal Catalytic Converter, 51205 (Part No.51205)

MagnaFlow Oem Grade Federal / Epa Compliant Universal Catalytic Converter, 51205

from

$213.99
Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Universal Catalytic Converter 51205. The Universal design allows the part to fit a wide array of vehicles, and the stainless steel construction of this catalytic converter is highly resistant to corrosion. The single laser fusion welds greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. This replacement part is designed to meet or exceed Federal emissions requirements set forth by the EPA, complying with legal standards for OBDII Federally registered vehicles with Federal/EPA Emission systems.
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MagnaFlow – MagnaFlow California Grade Carb Compliant Direct-Fit Catalytic Converter, 557107 (Part No.557107)

MagnaFlow California Grade Carb Compliant Direct-Fit Catalytic Converter, 557107

from

$861.99
Keep the check engine light off with MagnaFlow California Grade CARB Compliant Direct-Fit Catalytic Converter 557107. With features including free-flowing mandrel-bent tubing and highly corrosion resistant stainless steel construction, easily install this converter yourself using the proper tools, no cutting or welding required. MagnaFlow’s state-of-the-art metrology department uses the latest 3D scanning systems during research and development, so you can be confident that your new part will fit and function like the original equipment. By replicating the OE design, the single laser fusion weld greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. This Direct-Fit Catalytic Converter is designed to fit the 2014-2016 Chevrolet Impala Limited 3.6L & 2012-2013 Chevrolet Impala 3.6L. MagnaFlow 557107 includes (2) Nuts, (2) Bolts, (1) Torca Clamp, (1) Flange Gasket. This replacement part is designed to meet or exceed California Air Resource Board requirements, and has undergone additional testing to comply with CARB guidelines to allow for legal use in California and CARB restricted states, for the listed vehicles.
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MagnaFlow – MagnaFlow Oem Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 52107 (Part No.52107)

MagnaFlow Oem Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 52107

from

$552.99
Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Direct-Fit Catalytic Converter 52107. With features including free-flowing mandrel-bent tubing and highly corrosion resistant stainless steel construction, easily install this converter yourself using the proper tools, no cutting or welding required. MagnaFlow’s state-of-the-art metrology department uses the latest 3D scanning systems during research and development, so you can be confident that your new part will fit and function like the original equipment. By replicating the OE design, the single laser fusion weld greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. This Direct-Fit Catalytic Converter is designed to fit the 2014-2016 Chevrolet Impala Limited 3.6L & 2012-2013 Chevrolet Impala 3.6L. MagnaFlow 52107 includes (2) Nuts, (2) Bolts, (1) Torca Clamp, (1) Flange Gasket. This replacement part is designed to meet or exceed Federal emissions requirements set forth by the EPA, complying with legal standards for OBDII Federally registered vehicles with California or Federal/EPA Emission systems.
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Walker – Walker Ultra EPA Direct Fit Catalytic Converter Overall Length 36.625 IN, 54627 (Part No.54627)

Walker Ultra EPA Direct Fit Catalytic Converter Overall Length 36.625 IN, 54627

from

$493.99
Designed to comply with EPA standards while delivering premium performance with assured compliance, Walker Ultra direct-fit catalytic converters are available for import and domestic OBDII (1996 and newer) vehicles. Count on Walker Ultra converters for industry-leading fit and function.
See More

MagnaFlow – MagnaFlow California Grade Carb Compliant Direct-Fit Catalytic Converter, 4561195 (Part No.4561195)

MagnaFlow California Grade Carb Compliant Direct-Fit Catalytic Converter, 4561195

from

$1773.00
Keep the check engine light off with MagnaFlow California Grade CARB Compliant Direct-Fit Catalytic Converter 4561195. With features including free-flowing mandrel-bent tubing and highly corrosion resistant stainless steel construction, easily install this converter yourself using the proper tools, no cutting or welding required. MagnaFlow’s state-of-the-art metrology department uses the latest 3D scanning systems during research and development, so you can be confident that your new part will fit and function like the original equipment. By replicating the OE design, the single laser fusion weld greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. This Direct-Fit Catalytic Converter is designed to fit the 2006 Chevrolet Impala 3.5L & 2006 Chevrolet Monte Carlo 3.5L. MagnaFlow 4561195 includes (1) Flange Gasket, (1) Crush Ring Gasket. This replacement part is designed to meet or exceed California Air Resource Board requirements, and has undergone additional testing to comply with CARB guidelines to allow for legal use in California and CARB restricted states, for the listed vehicles.
See More

Walker – Walker EPA Ultra-Boxed Direct Fit Converter, 16537 (Part No.16537)

Walker EPA Ultra-Boxed Direct Fit Converter, 16537

from

$433.99
Walker Ultra Direct-Fit Catalytic Converters, an industry leader for import And domestic applications, are engineered with durable stainless steel bodies. Walker Ultra Catalytic Converters are available for OBDII (1996 And newer) vehicles. Engineered for specific vehicle emissions requirements, And features a higher loading of precious metals, optimal substrate content, And a high technology washcoat to provide unsurpassed performance, And durability. Walker Ultra Catalytic Converters meet EPA emission requirements, And have a 25,000-mile catalytic performance warranty, in addition to a 5-year/50,000-mile structural integrity warranty.
See More

MagnaFlow – MagnaFlow Oem Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 52185 (Part No.52185)

MagnaFlow Oem Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 52185

from

$819.99
Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Direct-Fit Catalytic Converter 52185. With features including free-flowing mandrel-bent tubing and highly corrosion resistant stainless steel construction, easily install this converter yourself using the proper tools, no cutting or welding required. MagnaFlow’s state-of-the-art metrology department uses the latest 3D scanning systems during research and development, so you can be confident that your new part will fit and function like the original equipment. By replicating the OE design, the single laser fusion weld greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. This Direct-Fit Catalytic Converter is designed to fit the 2014-2016 Chevrolet Impala Limited 3.6L & 2012-2013 Chevrolet Impala 3.6L. MagnaFlow 52185 includes (2) Nuts, (2) Bolts, (1) Flange Gasket. This replacement part is designed to meet or exceed Federal emissions requirements set forth by the EPA, complying with legal standards for OBDII Federally registered vehicles with California or Federal/EPA Emission systems.
See More

MagnaFlow – MagnaFlow Oem Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 52001 (Part No.52001)

MagnaFlow Oem Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 52001

from

$779.99
Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Direct-Fit Catalytic Converter 52001. With features including free-flowing mandrel-bent tubing and highly corrosion resistant stainless steel construction, easily install this converter yourself using the proper tools, no cutting or welding required. MagnaFlow’s state-of-the-art metrology department uses the latest 3D scanning systems during research and development, so you can be confident that your new part will fit and function like the original equipment. By replicating the OE design, the single laser fusion weld greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. MagnaFlow 52001 includes (2) Nuts, (2) Flat Washers and interchanges with OE parts 19419593, 20894010, 20926629, 20929216, 20965402, 23276243, 84216836, 84216838, 84647489. This replacement part is designed to meet or exceed Federal emissions requirements set forth by the EPA, complying with legal standards for OBDII Federally registered vehicles with California or Federal/EPA Emission systems.
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Walker – "Walker CalCat CARB Direct Fit Catalytic Converter 2.15"" Outlet (OD), 84597" (Part No.84597)

"Walker CalCat CARB Direct Fit Catalytic Converter 2.15"" Outlet (OD), 84597"

from

$2194.00
Designed, tested and validated for assured compliance to meet CARB standards, Walker CalCat direct-fit catalytic converters are available for OBDII (1996 and newer) and non-OBD (1995 and older) vehicles and delivers a precise OE-style fit. Walker CalCat catalytic converters are thoroughly tested to ensure they meet CARB performance requirements.
See More

MagnaFlow – MagnaFlow California Grade Carb Compliant Universal Catalytic Converter, 408005 (Part No.408005)

MagnaFlow California Grade Carb Compliant Universal Catalytic Converter, 408005

from

$345.99
Keep the check engine light off with MagnaFlow California Grade CARB Compliant Universal Catalytic Converter 408005. The Universal design allows the part to fit a wide array of vehicles, and the stainless steel construction of this catalytic converter is highly resistant to corrosion. The single laser fusion weld greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. This replacement part is designed to meet or exceed California Air Resource Board requirements, and has undergone additional testing to comply with CARB guidelines to allow for legal use in California and CARB restricted states, for the listed vehicles.
See More

MagnaFlow – MagnaFlow Oem Grade Federal / Epa Compliant Universal Catalytic Converter, 51206 (Part No.51206)

MagnaFlow Oem Grade Federal / Epa Compliant Universal Catalytic Converter, 51206

from

$213.99
Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Universal Catalytic Converter 51206. The Universal design allows the part to fit a wide array of vehicles, and the stainless steel construction of this catalytic converter is highly resistant to corrosion. The single laser fusion welds greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. This replacement part is designed to meet or exceed Federal emissions requirements set forth by the EPA, complying with legal standards for OBDII Federally registered vehicles with Federal/EPA Emission systems.
See More

Walker – "Walker CalCat CARB Universal Catalytic Converter 2.5"" Inlet (ID) 2.5""Outlet (ID), 81328" (Part No.81328)

"Walker CalCat CARB Universal Catalytic Converter 2.5"" Inlet (ID) 2.5""Outlet (ID), 81328"

from

$437.99
Designed, tested and validated for assured compliance to meet CARB standards, Walker CalCat universal catalytic converters are available for OBDII (1996 and newer) and non-OBD (1995 and older) vehicles. Walker CalCat catalytic converters are thoroughly tested to ensure they meet CARB performance requirements.
See More

Walker – Walker Exhaust Pipe Flange Gasket, 31512 (Part No.31512)

Walker Exhaust Pipe Flange Gasket, 31512

from

$6.39
Complete your exhaust repair with Walker gaskets and flanges. Built from quality materials for long lasting durability, they’re available in a range of styles and sizes. Each component is designed to work seamlessly with OE exhaust systems and Walker aftermarket replacement parts.
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Walker – Walker Exhaust Pipe Flange Gasket, 31578 (Part No.31578)

Walker Exhaust Pipe Flange Gasket, 31578

from

$9.89
Complete your exhaust repair with Walker gaskets and flanges. Built from quality materials for long lasting durability, they’re available in a range of styles and sizes. Each component is designed to work seamlessly with OE exhaust systems and Walker aftermarket replacement parts.
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Walker – Walker Exhaust Pipe Flange Gasket, 31599 (Part No.31599)

Walker Exhaust Pipe Flange Gasket, 31599

from

$19.79
Complete your exhaust repair with Walker gaskets and flanges. Built from quality materials for long lasting durability, they’re available in a range of styles and sizes. Each component is designed to work seamlessly with OE exhaust systems and Walker aftermarket replacement parts.
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Walker – Walker Exhaust Pipe Flange Gasket, 31602 (Part No.31602)

Walker Exhaust Pipe Flange Gasket, 31602

from

$9.89
Complete your exhaust repair with Walker gaskets and flanges. Built from quality materials for long lasting durability, they’re available in a range of styles and sizes. Each component is designed to work seamlessly with OE exhaust systems and Walker aftermarket replacement parts.
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Walker – Walker Exhaust Pipe Flange Gasket, 31605 (Part No.31605)

Walker Exhaust Pipe Flange Gasket, 31605

from

$19.79
Complete your exhaust repair with Walker gaskets and flanges. Built from quality materials for long lasting durability, they’re available in a range of styles and sizes. Each component is designed to work seamlessly with OE exhaust systems and Walker aftermarket replacement parts.
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Walker – Walker Exhaust Pipe Flange Gasket, 31337 (Part No.31337)

Walker Exhaust Pipe Flange Gasket, 31337

from

$5.49
Complete your exhaust repair with Walker gaskets and flanges. Built from quality materials for long lasting durability, they’re available in a range of styles and sizes. Each component is designed to work seamlessly with OE exhaust systems and Walker aftermarket replacement parts.
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Victor Reinz – Victor Reinz Catalytic Converter Gasket, 71-13618-00 (Part No.71-13618-00)

Victor Reinz Catalytic Converter Gasket, 71-13618-00

from

$5.79
With Victor Reinz gaskets, you can be sure you are getting sealing solutions that deliver OE quality gasket technology and engineering. That is because Victor Reinz is an original equipment supplier and the trusted choice of manufacturers the world over, offering broad coverage for foreign and domestic cars and trucks. In Victor Reinz gasket sets, you get the right combination of components needed for fast, long-lasting repairs.
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Most Popular Catalytic Converter Gaskets for 2003 Chevrolet Impalas

Enhance your 2003 Chevrolet Impala with one of the 4 Catalytic Converter Gaskets we have in stock, starting at just $5.79.

Walker – Walker Exhaust Pipe Flange Gasket, 31602 (Part No.31602)

Walker Exhaust Pipe Flange Gasket, 31602

from

$9.89
Complete your exhaust repair with Walker gaskets and flanges. Built from quality materials for long lasting durability, they’re available in a range of styles and sizes. Each component is designed to work seamlessly with OE exhaust systems and Walker aftermarket replacement parts.
See More

Walker – Walker Exhaust Pipe Flange Gasket, 31578 (Part No.31578)

Walker Exhaust Pipe Flange Gasket, 31578

from

$9.89
Complete your exhaust repair with Walker gaskets and flanges. Built from quality materials for long lasting durability, they’re available in a range of styles and sizes. Each component is designed to work seamlessly with OE exhaust systems and Walker aftermarket replacement parts.
See More

Walker – Walker Exhaust Pipe Flange Gasket, 31605 (Part No.31605)

Walker Exhaust Pipe Flange Gasket, 31605

from

$19.79
Complete your exhaust repair with Walker gaskets and flanges. Built from quality materials for long lasting durability, they’re available in a range of styles and sizes. Each component is designed to work seamlessly with OE exhaust systems and Walker aftermarket replacement parts.
See More

Victor Reinz – Victor Reinz Catalytic Converter Gasket, 71-13618-00 (Part No.71-13618-00)

Victor Reinz Catalytic Converter Gasket, 71-13618-00

from

$5.79
With Victor Reinz gaskets, you can be sure you are getting sealing solutions that deliver OE quality gasket technology and engineering. That is because Victor Reinz is an original equipment supplier and the trusted choice of manufacturers the world over, offering broad coverage for foreign and domestic cars and trucks. In Victor Reinz gasket sets, you get the right combination of components needed for fast, long-lasting repairs.
See More

Best-Selling 2003 Chevrolet Impala Catalytic Converters

Upgrade your Impala with one of our 15 best-selling Catalytic Converters, earning an average 4.19 stars rating across 58 reviews.

Walker – Walker EPA Ultra-Boxed Direct Fit Converter, 16536 (Part No.16536)

Walker EPA Ultra-Boxed Direct Fit Converter, 16536

from

$417.99
Walker Ultra Direct-Fit Catalytic Converters, an industry leader for import And domestic applications, are engineered with durable stainless steel bodies. Walker Ultra Catalytic Converters are available for OBDII (1996 And newer) vehicles. Engineered for specific vehicle emissions requirements, And features a higher loading of precious metals, optimal substrate content, And a high technology washcoat to provide unsurpassed performance, And durability. Walker Ultra Catalytic Converters meet EPA emission requirements, And have a 25,000-mile catalytic performance warranty, in addition to a 5-year/50,000-mile structural integrity warranty.
See More

Walker – Walker Ultra EPA Direct Fit Catalytic Converter Overall Length 36.625 IN, 54627 (Part No.54627)

Walker Ultra EPA Direct Fit Catalytic Converter Overall Length 36.625 IN, 54627

from

$493.99
Designed to comply with EPA standards while delivering premium performance with assured compliance, Walker Ultra direct-fit catalytic converters are available for import and domestic OBDII (1996 and newer) vehicles. Count on Walker Ultra converters for industry-leading fit and function.
See More

MagnaFlow – MagnaFlow Hm Grade Federal / Epa Compliant Universal Catalytic Converter, 99306HM (Part No.99306HM)

MagnaFlow Hm Grade Federal / Epa Compliant Universal Catalytic Converter, 99306HM

from

$204.99
Keep the check engine light off with MagnaFlow HM Grade Federal/EPA Compliant Universal Catalytic Converter 99306HM. The Universal design allows the part to fit a wide array of vehicles, and the stainless steel construction of this catalytic converter is highly resistant to corrosion. The single laser fusion weld greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. This replacement part is designed to meet or exceed Federal emissions requirements set forth by the EPA, complying with legal standards for OBDII Federally registered vehicles with Federal/EPA Emission systems.
See More

MagnaFlow – MagnaFlow Hm Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 23433 (Part No.23433)

MagnaFlow Hm Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 23433

from

$412.99
Keep the check engine light off with MagnaFlow HM Grade Federal/EPA Compliant Direct-Fit Catalytic Converter 23433. With features including free-flowing mandrel-bent tubing and highly corrosion resistant stainless steel construction, easily install this converter yourself using the proper tools, no cutting or welding required. MagnaFlow’s state-of-the-art metrology department uses the latest 3D scanning systems during research and development, so you can be confident that your new part will fit and function like the original equipment. By replicating the OE design, the single laser fusion weld greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. MagnaFlow 23433 includes (1) Flange Gasket, (1) Crush Ring Gasket. This replacement part is designed to meet or exceed Federal emissions requirements set forth by the EPA, complying with legal standards for OBDII Federally registered vehicles with Federal/EPA Emission systems.
See More

Walker – "Walker Ultra EPA Universal Catalytic Converter 2.5"" Inlet (ID) 2.5"" Outlet (ID), 93253" (Part No.93253)

"Walker Ultra EPA Universal Catalytic Converter 2.5"" Inlet (ID) 2.5"" Outlet (ID), 93253"

from

$365.99
Designed to meet EPA emissions requirements while delivering premium performance and durability, Walker Ultra universal catalytic converters fit import and domestic OBDII (1996 and newer) vehicles. Each converter features an OE style high technology washcoat with an optimal precious metal load for assured compliance.
See More

Walker – Walker Ultra EPA Direct Fit Catalytic Converter Overall Length 38.500 IN, 54626 (Part No.54626)

Walker Ultra EPA Direct Fit Catalytic Converter Overall Length 38.500 IN, 54626

from

$467.99
Designed to comply with EPA standards while delivering premium performance with assured compliance, Walker Ultra direct-fit catalytic converters are available for import and domestic OBDII (1996 and newer) vehicles. Count on Walker Ultra converters for industry-leading fit and function.
See More

MagnaFlow – MagnaFlow Hm Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 23405 (Part No.23405)

MagnaFlow Hm Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 23405

from

$426.99
Keep the check engine light off with MagnaFlow HM Grade Federal/EPA Compliant Direct-Fit Catalytic Converter 23405. With features including free-flowing mandrel-bent tubing and highly corrosion resistant stainless steel construction, easily install this converter yourself using the proper tools, no cutting or welding required. MagnaFlow’s state-of-the-art metrology department uses the latest 3D scanning systems during research and development, so you can be confident that your new part will fit and function like the original equipment. By replicating the OE design, the single laser fusion weld greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. MagnaFlow 23405 includes (1) Flange Gasket, (1) Crush Ring Gasket. This replacement part is designed to meet or exceed Federal emissions requirements set forth by the EPA, complying with legal standards for OBDII Federally registered vehicles with Federal/EPA Emission systems.
See More

MagnaFlow – MagnaFlow Oem Grade Federal / Epa Compliant Universal Catalytic Converter, 51306 (Part No.51306)

MagnaFlow Oem Grade Federal / Epa Compliant Universal Catalytic Converter, 51306

from

$221.99
Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Universal Catalytic Converter 51306. The Universal design allows the part to fit a wide array of vehicles, and the stainless steel construction of this catalytic converter is highly resistant to corrosion. The single laser fusion welds greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. This replacement part is designed to meet or exceed Federal emissions requirements set forth by the EPA, complying with legal standards for OBDII Federally registered vehicles with Federal/EPA Emission systems.
See More

MagnaFlow – MagnaFlow Oem Grade Federal / Epa Compliant Universal Catalytic Converter, 51206 (Part No.51206)

MagnaFlow Oem Grade Federal / Epa Compliant Universal Catalytic Converter, 51206

from

$213.99
Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Universal Catalytic Converter 51206. The Universal design allows the part to fit a wide array of vehicles, and the stainless steel construction of this catalytic converter is highly resistant to corrosion. The single laser fusion welds greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. This replacement part is designed to meet or exceed Federal emissions requirements set forth by the EPA, complying with legal standards for OBDII Federally registered vehicles with Federal/EPA Emission systems.
See More

Walker – Walker EPA Ultra-Boxed Direct Fit Converter, 16537 (Part No.16537)

Walker EPA Ultra-Boxed Direct Fit Converter, 16537

from

$433.99
Walker Ultra Direct-Fit Catalytic Converters, an industry leader for import And domestic applications, are engineered with durable stainless steel bodies. Walker Ultra Catalytic Converters are available for OBDII (1996 And newer) vehicles. Engineered for specific vehicle emissions requirements, And features a higher loading of precious metals, optimal substrate content, And a high technology washcoat to provide unsurpassed performance, And durability. Walker Ultra Catalytic Converters meet EPA emission requirements, And have a 25,000-mile catalytic performance warranty, in addition to a 5-year/50,000-mile structural integrity warranty.
See More

MagnaFlow – MagnaFlow Hm Grade Federal / Epa Compliant Universal Catalytic Converter, 99206HM (Part No.99206HM)

MagnaFlow Hm Grade Federal / Epa Compliant Universal Catalytic Converter, 99206HM

from

$196.99
Keep the check engine light off with MagnaFlow HM Grade Federal/EPA Compliant Universal Catalytic Converter 99206HM. The Universal design allows the part to fit a wide array of vehicles, and the stainless steel construction of this catalytic converter is highly resistant to corrosion. The single laser fusion weld greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. This replacement part is designed to meet or exceed Federal emissions requirements set forth by the EPA, complying with legal standards for OBDII Federally registered vehicles with Federal/EPA Emission systems.
See More

MagnaFlow – MagnaFlow California Grade Carb Compliant Direct-Fit Catalytic Converter, 4561396 (Part No.4561396)

MagnaFlow California Grade Carb Compliant Direct-Fit Catalytic Converter, 4561396

from

$1310.00
Keep the check engine light off with MagnaFlow California Grade CARB Compliant Direct-Fit Catalytic Converter 4561396. With features including free-flowing mandrel-bent tubing and highly corrosion resistant stainless steel construction, easily install this converter yourself using the proper tools, no cutting or welding required. MagnaFlow’s state-of-the-art metrology department uses the latest 3D scanning systems during research and development, so you can be confident that your new part will fit and function like the original equipment. By replicating the OE design, the single laser fusion weld greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. MagnaFlow 4561396 includes (1) Flange Gasket, (1) Crush Ring Gasket. This replacement part is designed to meet or exceed California Air Resource Board requirements, and has undergone additional testing to comply with CARB guidelines to allow for legal use in California and CARB restricted states, for the listed vehicles.
See More

Walker – "Walker CalCat CARB Universal Catalytic Converter 2.5"" Inlet (ID) 2.5"" Outlet (ID), 82618" (Part No.82618)

"Walker CalCat CARB Universal Catalytic Converter 2.5"" Inlet (ID) 2.5"" Outlet (ID), 82618"

from

$706.99
Designed, tested and validated for assured compliance to meet CARB standards, Walker CalCat universal catalytic converters are available for OBDII (1996 and newer) and non-OBD (1995 and older) vehicles. Walker CalCat catalytic converters are thoroughly tested to ensure they meet CARB performance requirements.
See More

MagnaFlow – MagnaFlow Oem Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 51396 (Part No.51396)

MagnaFlow Oem Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 51396

from

$447.99
Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Direct-Fit Catalytic Converter 51396. With features including free-flowing mandrel-bent tubing and highly corrosion resistant stainless steel construction, easily install this converter yourself using the proper tools, no cutting or welding required. MagnaFlow’s state-of-the-art metrology department uses the latest 3D scanning systems during research and development, so you can be confident that your new part will fit and function like the original equipment. By replicating the OE design, the single laser fusion weld greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. MagnaFlow 51396 includes (1) Flange Gasket, (1) Crush Ring Gasket. This replacement part is designed to meet or exceed Federal emissions requirements set forth by the EPA, complying with legal standards for OBDII Federally registered vehicles with California or Federal/EPA Emission systems.
See More

MagnaFlow – MagnaFlow Oem Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 51532 (Part No.51532)

MagnaFlow Oem Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 51532

from

$433.99
Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Direct-Fit Catalytic Converter 51532. With features including free-flowing mandrel-bent tubing and highly corrosion resistant stainless steel construction, easily install this converter yourself using the proper tools, no cutting or welding required. MagnaFlow’s state-of-the-art metrology department uses the latest 3D scanning systems during research and development, so you can be confident that your new part will fit and function like the original equipment. By replicating the OE design, the single laser fusion weld greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. MagnaFlow 51532 includes (1) Flange Gasket, (1) Crush Ring Gasket. This replacement part is designed to meet or exceed Federal emissions requirements set forth by the EPA, complying with legal standards for OBDII Federally registered vehicles with California or Federal/EPA Emission systems.
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Top-Rated Catalytic Converter Brands For Your 2003 Chevrolet Impala

When it comes to finding the perfect Catalytic Converter for your 2003 Chevrolet Impala, Advance Auto Parts has you covered with a wide selection of high-quality OEM and aftermarket options from 3 trusted brands. We carry the most popular Catalytic Converter brands including Walker and MagnaFlow, and more, all known for their exceptional customer ratings (average brand rating of 4.2 stars) and competitive prices, as low as $9.89. Purchasing a Catalytic Converter from us here at Advance Auto Parts is a smart move for both you and your 2003 Chevrolet Impala, providing peace of mind with parts that meet or exceed OEM standards.

Popular Walker 2003 Chevrolet Impala Catalytic Converters

If you’re looking for a top-quality Catalytic Converter for your 2003 Chevrolet Impala, Advance Auto Parts has exactly what you need with our selection of Walker Catalytic Converters. We have 3 Walker Catalytic Converters in stock for this fitment, all known for their durability and precision fit. With prices starting at just $9.89 and an average cost of $145.92, you’ll find the perfect Catalytic Converter for your needs and budget. Walker Catalytic Converters for the 2003 Chevrolet Impala come highly rated, with over 27 customer reviews and an impressive average rating of 4.2 stars. Choosing a Walker Catalytic Converter from Advance Auto Parts is a smart move to ensure quality and value for your vehicle.
Walker Exhaust Pipe Flange Gasket, 31578
from $9.89
(24)
Walker Exhaust Pipe Flange Gasket, 31578
“No issues.”
Walker Exhaust Pipe Flange Gasket, 31602
from $9.89
(2)
Walker Exhaust Pipe Flange Gasket, 31602
“A+++++”
Walker EPA Ultra-Boxed Direct Fit Converter, 16536
from $417.99
(1)
Walker EPA Ultra-Boxed Direct Fit Converter, 16536
“Fit just like the original.”

Top-Quality MagnaFlow 2003 Chevrolet Impala Catalytic Converters

For those in search of a high-quality Catalytic Converter for their 2003 Chevrolet Impala, Advance Auto Parts offers a great selection of MagnaFlow Catalytic Converters. With 3 MagnaFlow Catalytic Converters in stock, you can trust you’re getting top-tier parts designed for durability and a perfect fit. Prices for these Catalytic Converters start at just $204.99, with an average price of $348.32, giving you a range of options to suit your budget. Backed by over 24 customer ratings and an average rating of 4.1 stars, MagnaFlow Catalytic Converters provide both reliability and excellent performance. Choosing a MagnaFlow Catalytic Converter from Advance Auto Parts is a smart investment in your vehicle’s performance and longevity.
MagnaFlow Hm Grade Federal / Epa Compliant Universal Catalytic Converter, 99306HM
from $204.99
(6)
MagnaFlow Hm Grade Federal / Epa Compliant Universal Catalytic Converter, 99306HM
“Worked perfect for the car, enough back pressure the “check engine” light doesn’t come on. It is a little louder than stock converter, but definitely ”
MagnaFlow Hm Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 23433
from $412.99
(5)
MagnaFlow Hm Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 23433
“After several mechanics “Checking” my car for months and numerous friends making suggestions, I finally made the decision to go on line to Advance Aut”
MagnaFlow Hm Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 23405
from $426.99
(13)
MagnaFlow Hm Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 23405
“This product fit perfectly and sounds great. Even though it came with gaskets, I ordered some different ones as they were a better quality. it has a ”

FAQs for 2003 Chevrolet Impala Catalytic Converters

What are the best-selling Catalytic Converters for 2003 Chevrolet Impalas?

Out of 19 Catalytic Converters that fit 2003 Chevrolet Impalas, the following parts are the top sellers:

What’s the price range for 2003 Chevrolet Impala Catalytic Converters?

The prices of Catalytic Converters for the 2003 Chevrolet Impala range from $5.79 up to $1,310.00 for the most premium parts.

What is the average price of a Catalytic Converter for a 2003 Chevrolet Impala?

The average price for Catalytic Converters for the 2003 Chevrolet Impala is $348.85. Keep in mind the variety of part types within our Catalytic Converter category, where you are likely to find a wide range of prices across a variety of parts and components.

Does Advance Auto Parts sell Catalytic Converters for other Chevrolet Impala model years?

Yes, we carry Catalytic Converters for 33 model years of Chevrolet Impalas between 1975 and 2020. The following model years are the most popular for Catalytic Converter purchases: 2020, 2019, 2018, 2017, 2016, 2015, 2014, 2013, and 2012.

What are the cheapest Catalytic Converters for my 2003 Chevrolet Impala?

The cheapest 2003 Chevrolet Impala Catalytic Converters we carry are:

Does Advance Auto Parts sell Catalytic Converters for any other 2003 Chevrolet models?

Yes. We stock Catalytic Converters for 24 other popular 2003 Chevrolet models. Some of the most popular are 2003 Tahoe Catalytic Converters, 2003 Silverado 1500 Catalytic Converters, 2003 Malibu Catalytic Converters, 2003 Suburban 1500 Catalytic Converters, and 2003 Monte Carlo Catalytic Converters.

What are the top-rated Catalytic Converters that fit the 2003 Chevrolet Impala?

Based on 249 reviews by customers, our 2003 Chevrolet Impala Catalytic Converters have an average customer rating of 4.0 stars. These are the highest-rated categories of Catalytic Converters for the 2003 Chevrolet Impala and their top-rated products:

What types of Catalytic Converters do you sell for my 2003 Chevrolet Impala?

As of 8/2/26, these are some of the most in-demand types of Catalytic Converters for a 2003 Chevrolet Impala:

Can I get help with 2003 Chevrolet Impala Catalytic Converter orders?

Contact our customer support team by chat or phone, through the help desk page, where you can find instant answers about Chevrolet Catalytic Converters and more.

What is your return policy for Chevrolet Impala Catalytic Converters?

Advance Auto Parts keeps returns simple. For new Chevrolet Impala Catalytic Converters and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.