Cadillac STS Catalytic Converters

Your One-Stop Shop For Trusted Cadillac STS Catalytic Converters

If you’re in search of Cadillac STS Catalytic Converters aftermarket or OEM parts, consider your search over! Advance Auto Parts carries 20 Catalytic Converters from top brands with prices ranging from $7.69 to $1,219.00.

Beyond great prices, we stock trusted brands manufacturing all types of Catalytic Converters for your Cadillac STS.

And don’t forget to read customer reviews across all Catalytic Converters categories in our catalog. Buy with confidence by leveraging past customer experiences of our aftermarket and OEM parts.

At Advance Auto Parts, we don’t think top quality Catalytic Converters have to cost top dollar, and we prove it. Browse our top Cadillac STS Catalytic Converters below, order online to ship to your home, or head into your nearest Advance Auto Parts location to get started.

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Essential Cadillac STS Catalytic Converters

MagnaFlow – MagnaFlow Hm Grade Federal / Epa Compliant Universal Catalytic Converter, 99204HM (Part No.99204HM)

MagnaFlow Hm Grade Federal / Epa Compliant Universal Catalytic Converter, 99204HM

from

$196.99
Keep the check engine light off with MagnaFlow HM Grade Federal/EPA Compliant Universal Catalytic Converter 99204HM. 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.
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MagnaFlow – MagnaFlow Oem Grade Federal / Epa Compliant Direct-Fit Manifold Catalytic Converter, 51071 (Part No.51071)

MagnaFlow Oem Grade Federal / Epa Compliant Direct-Fit Manifold Catalytic Converter, 51071

from

$1048.00
Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Direct-Fit Manifold Catalytic Converter 51071. 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 Manifold Catalytic Converter is designed to fit the 2004-2009 Cadillac SRX 4.6L & 2005-2010 Cadillac STS 4.6L. MagnaFlow 51071 includes (1) Donut 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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MagnaFlow – MagnaFlow Oem Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 51502 (Part No.51502)

MagnaFlow Oem Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 51502

from

$706.99
Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Direct-Fit Catalytic Converter 51502. 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 2004-2008 Cadillac SRX 3.6L & 2005-2007 Cadillac STS 3.6L. MagnaFlow 51502 includes (4) Nuts, (4) Bolts, (1) Donut 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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MagnaFlow – MagnaFlow Hm Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 24232 (Part No.24232)

MagnaFlow Hm Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 24232

from

$672.99
Keep the check engine light off with MagnaFlow HM Grade Federal/EPA Compliant Direct-Fit Catalytic Converter 24232. 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 2004-2008 Cadillac SRX 3.6L & 2005-2007 Cadillac STS 3.6L. MagnaFlow 24232 includes (4) Nuts, (4) Bolts, (1) Donut 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.
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Walker – "Walker CalCat CARB Universal Catalytic Converter 2.25"" Inlet (ID) 2.25"" Outlet (ID) Overall Length 12.030 IN, 84615" (Part No.84615)

"Walker CalCat CARB Universal Catalytic Converter 2.25"" Inlet (ID) 2.25"" Outlet (ID) Overall Length 12.030 IN, 84615"

from

$396.99
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.
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Walker – "Walker Ultra EPA Direct Fit Catalytic Converter 2.24"" Outlet (OD), 16685" (Part No.16685)

"Walker Ultra EPA Direct Fit Catalytic Converter 2.24"" Outlet (OD), 16685"

from

$572.99
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.
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MagnaFlow – MagnaFlow Oem Grade Federal / Epa Compliant Direct-Fit Manifold Catalytic Converter, 51070 (Part No.51070)

MagnaFlow Oem Grade Federal / Epa Compliant Direct-Fit Manifold Catalytic Converter, 51070

from

$678.99
Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Direct-Fit Manifold Catalytic Converter 51070. 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 Manifold Catalytic Converter is designed to fit the 2004-2009 Cadillac SRX 4.6L & 2005-2010 Cadillac STS 4.6L. MagnaFlow 51070 includes (1) Donut 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, 52502 (Part No.52502)

Walker Ultra EPA Direct Fit Catalytic Converter, 52502

from

$1113.00
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.
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Walker – "Walker CalCat CARB Universal Catalytic Converter 2.25"" Inlet (ID) 2.25"" Outlet (ID), 82815" (Part No.82815)

"Walker CalCat CARB Universal Catalytic Converter 2.25"" Inlet (ID) 2.25"" Outlet (ID), 82815"

from

$624.99
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.
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MagnaFlow – MagnaFlow Oem Grade Federal / Epa Compliant Universal Catalytic Converter, 51204 (Part No.51204)

MagnaFlow Oem Grade Federal / Epa Compliant Universal Catalytic Converter, 51204

from

$213.99
Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Universal Catalytic Converter 51204. 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 Oem Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 49170 (Part No.49170)

MagnaFlow Oem Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 49170

from

$519.99
Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Direct-Fit Catalytic Converter 49170. 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 49170 includes (4) 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.
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MagnaFlow – MagnaFlow Hm Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 24403 (Part No.24403)

MagnaFlow Hm Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 24403

from

$864.99
Keep the check engine light off with MagnaFlow HM Grade Federal/EPA Compliant Direct-Fit Catalytic Converter 24403. 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 2004-2008 Cadillac SRX 3.6L & 2005-2007 Cadillac STS 3.6L. MagnaFlow 24403 includes (4) Nuts, (4) Bolts, (1) Donut 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.
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Walker – Walker Exhaust Pipe Flange Gasket, 31534 (Part No.31534)

Walker Exhaust Pipe Flange Gasket, 31534

from

$7.69
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, 31357 (Part No.31357)

Walker Exhaust Pipe Flange Gasket, 31357

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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Catalytic Converters Brands You Can Trust For Your Cadillac STS

2 trusted brands of Catalytic Converters line our shelves, ready to help keep your Cadillac STS running smooth. Below are some of the most popular brands and their top Catalytic Converters offerings:

Most Purchased Cadillac STS Catalytic Converters from Walker

When you buy the most frequently purchased Walker brand Catalytic Converters, you can be confident it will be the right part for your Cadillac STS. Here are the Walker Catalytic Converters Advanced Auto customers buy the most:
Walker Exhaust Pipe Flange Gasket, 31534
from $7.69
(23)
Walker Exhaust Pipe Flange Gasket, 31534
Catalytic Converter Gaskets

FAQs for Cadillac STS Catalytic Converters

What are the most purchased Catalytic Converters for the Cadillac STS?

Out of 20 Catalytic Converters for the Cadillac STS, the most popular in our inventory are:
"Walker Ultra EPA Direct Fit Catalytic Converter 2.24"" Outlet (OD), 16685"
from $572.99
This product is not rated
"Walker Ultra EPA Direct Fit Catalytic Converter 2.24"" Outlet (OD), 16685"
Catalytic Converters
"Walker Ultra EPA Direct Fit Catalytic Converter 2.24"" Outlet (OD), 16684"
from $581.99
This product is not rated
"Walker Ultra EPA Direct Fit Catalytic Converter 2.24"" Outlet (OD), 16684"
Catalytic Converters

What are the top-rated Cadillac STS Catalytic Converters?

Top-rated Catalytic Converters for your Cadillac STS based on customer reviews/ratings are:
MagnaFlow Hm Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 24232
from $672.99
(1)
MagnaFlow Hm Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 24232
“I wish I’d done this sooner instead of getting by with a piece of wood to prop my hood open”