2004 BMW 525i Catalytic Converters

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Keep Your 2004 BMW 525i in Top Shape with a Quality Catalytic Converter

When it comes to maintaining or upgrading your 2004 BMW 525i, choosing high-quality parts is crucial for ensuring your vehicle stays in top shape, whether you’re tackling a repair or enhancing performance. At Advance Auto Parts, we know how important it is to find the right Catalytic Converter for your 525i. We currently carry a top Catalytic Converter in stock that is built to last. Whether you’re replacing a damaged Catalytic Converter or looking to upgrade, our selection for the 2004 BMW 525i ensures you’ll find exactly what you need to keep your vehicle looking and performing its best.

Explore Related Parts

And while you’re here, don’t forget to check out related part categories like Exhaust Fittings and Exhaust Manifold and Headers to complete your upgrade or repair project. At Advance Auto Parts, we’re proud to offer the parts and expertise to keep your 2004 BMW 525i running smoothly and looking great.

Essential 2004 BMW 525i Catalytic Converters

Walker – "Walker CalCat CARB Universal Catalytic Converter 2.5"" Inlet (ID) 2"" Outlet (ID), 81133" (Part No.81133)

"Walker CalCat CARB Universal Catalytic Converter 2.5"" Inlet (ID) 2"" Outlet (ID), 81133"

from

$558.99
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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Dorman – Dorman Manifold Converter – CARB Compliant – Direct replacement, 673-897 (Part No.673-897)

Dorman Manifold Converter - CARB Compliant - Direct replacement, 673-897

from

$1713.00
This catalytic converter with integrated exhaust manifold – a.k.a. manifold converter – is precision-engineered to match the original equipment on specific vehicle years, makes and models for a reliable replacement.
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MagnaFlow – MagnaFlow Standard Grade Federal / Epa Compliant Universal Catalytic Converter, 94005 (Part No.94005)

MagnaFlow Standard Grade Federal / Epa Compliant Universal Catalytic Converter, 94005

from

$129.99
Keep the check engine light off with MagnaFlow Standard Grade Federal/EPA Compliant Universal Catalytic Converter 94005. Get the right fit for a wide array of vehicles thanks to the adaptable Universal design. With highly corrosion resistant, stainless steel construction, you can have confidence in the quality of this catalytic converter. This replacement part is designed to meet or exceed Federal emissions requirements set forth by the EPA, complying with legal standards for pre-OBDII Federally registered vehicles.
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MagnaFlow – MagnaFlow Standard Grade Federal / Epa Compliant Universal Catalytic Converter, 93507 (Part No.93507)

MagnaFlow Standard Grade Federal / Epa Compliant Universal Catalytic Converter, 93507

from

$205.99
Keep the check engine light off with MagnaFlow Standard Grade Federal/EPA Compliant Universal Catalytic Converter 93507. Get the right fit for a wide array of vehicles thanks to the adaptable Universal design. With highly corrosion resistant, stainless steel construction, you can have confidence in the quality of this catalytic converter. This replacement part is designed to meet or exceed Federal emissions requirements set forth by the EPA, complying with legal standards for pre-OBDII Federally registered vehicles.
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Walker – "Walker CalCat CARB Universal Catalytic Converter 2.5"" Inlet (ID) 2""Outlet (ID), 81333" (Part No.81333)

"Walker CalCat CARB Universal Catalytic Converter 2.5"" Inlet (ID) 2""Outlet (ID), 81333"

from

$633.99
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 California Grade Carb Compliant Direct-Fit Manifold Catalytic Converter, 452430 (Part No.452430)

MagnaFlow California Grade Carb Compliant Direct-Fit Manifold Catalytic Converter, 452430

from

$1442.00
Keep the check engine light off with MagnaFlow California Grade CARB Compliant Direct-Fit Manifold Catalytic Converter 452430. 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 2001-2003 BMW 525i 2.5L & 2001-2003 BMW 530i 3.0L. MagnaFlow 452430 includes (2) Nuts, (2) Bolts, (2) Flat Washers, (2) Flange Gaskets and interchanges with OE parts 18 40 7 507 347, 18 40 7 508 805, 18 40 7 514 498. 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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Dorman – Dorman Manifold Converter – CARB Compliant – Direct replacement, 673-898 (Part No.673-898)

Dorman Manifold Converter - CARB Compliant - Direct replacement, 673-898

from

$1782.00
This catalytic converter with integrated exhaust manifold – a.k.a. manifold converter – is precision-engineered to match the original equipment on specific vehicle years, makes and models for a reliable replacement.
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MagnaFlow – MagnaFlow Oem Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 51374 (Part No.51374)

MagnaFlow Oem Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 51374

from

$1095.00
Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Direct-Fit Catalytic Converter 51374. 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 51374 includes (1) Torca Clamp, (1) Flange Gasket and interchanges with OE parts 18 30 7 541 847, 18 30 7 541 849, 18 30 7 541 850. 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 Standard Grade Federal / Epa Compliant Universal Catalytic Converter, 94008 (Part No.94008)

MagnaFlow Standard Grade Federal / Epa Compliant Universal Catalytic Converter, 94008

from

$135.99
Keep the check engine light off with MagnaFlow Standard Grade Federal/EPA Compliant Universal Catalytic Converter 94008. Get the right fit for a wide array of vehicles thanks to the adaptable Universal design. With highly corrosion resistant, stainless steel construction, you can have confidence in the quality of this catalytic converter. This replacement part is designed to meet or exceed Federal emissions requirements set forth by the EPA, complying with legal standards for pre-OBDII Federally registered vehicles.
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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 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, 51375 (Part No.51375)

MagnaFlow Oem Grade Federal / Epa Compliant Direct-Fit Catalytic Converter, 51375

from

$1093.00
Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Direct-Fit Catalytic Converter 51375. 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 51375 includes (1) Torca Clamp, (1) Flange Gasket and interchanges with OE parts 18 30 7 541 848, 18 30 7 541 849, 18 30 7 541 850. 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 California Grade Carb Compliant Direct-Fit Manifold Catalytic Converter, 452298 (Part No.452298)

MagnaFlow California Grade Carb Compliant Direct-Fit Manifold Catalytic Converter, 452298

from

$1234.00
Keep the check engine light off with MagnaFlow California Grade CARB Compliant Direct-Fit Manifold Catalytic Converter 452298. 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 2004-2005 BMW 525i 2.5L & 2004-2005 BMW 530i 3.0L. MagnaFlow 452298 includes (2) Nuts, (2) Bolts, (2) Flat Washers, (2) Flange Gaskets and interchanges with OE parts 18 40 7 523 904. 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 California Grade Carb Compliant Universal Catalytic Converter, 3322008 (Part No.3322008)

MagnaFlow California Grade Carb Compliant Universal Catalytic Converter, 3322008

from

$723.99
Keep the check engine light off with MagnaFlow California Grade CARB Compliant Universal Catalytic Converter 3322008. 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.
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Most Popular Catalytic Converter for 2004 BMW 525is

Enhance your 2004 BMW 525i with this popular Catalytic Converter we have in stock, for $1,234.00.

MagnaFlow – MagnaFlow California Grade Carb Compliant Direct-Fit Manifold Catalytic Converter, 452298 (Part No.452298)

MagnaFlow California Grade Carb Compliant Direct-Fit Manifold Catalytic Converter, 452298

from

$1234.00
Keep the check engine light off with MagnaFlow California Grade CARB Compliant Direct-Fit Manifold Catalytic Converter 452298. 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 2004-2005 BMW 525i 2.5L & 2004-2005 BMW 530i 3.0L. MagnaFlow 452298 includes (2) Nuts, (2) Bolts, (2) Flat Washers, (2) Flange Gaskets and interchanges with OE parts 18 40 7 523 904. 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

FAQs for 2004 BMW 525i Catalytic Converters

What’s the price range for 2004 BMW 525i Catalytic Converters?

We currently have just one Catalytic Converters for the 2004 BMW 525i in stock: MagnaFlow California Grade Carb Compliant Direct-Fit Manifold Catalytic Converter, 452298 and it costs $1,234.00.

Does Advance Auto Parts sell Catalytic Converters for other BMW 525i model years?

Yes, we carry Catalytic Converters for 12 model years of BMW 525is between 1989 and 2007. The following model years are the most popular for Catalytic Converter purchases: 2007, 2006, 2005, 2003, 2002, 2001, 1995, 1994, and 1993.

Does Advance Auto Parts sell Catalytic Converters for any other 2004 BMW models?

Yes. We stock Catalytic Converters for 15 other popular 2004 BMW models. Some of the most popular are 2004 325i Catalytic Converters, 2004 325xi Catalytic Converters, 2004 530i Catalytic Converters, 2004 330i Catalytic Converters, and 2004 Z4 Catalytic Converters.

What types of Catalytic Converters do you sell for my 2004 BMW 525i?

We currently have just 1 Catalytic Converter in stock for a 2004 BMW 525i, and as of 8/2/26, it is a Catalytic Converter.

Can I get help with 2004 BMW 525i Catalytic Converter orders?

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

What is your return policy for BMW 525i Catalytic Converters?

Advance Auto Parts keeps returns simple. For new BMW 525i Catalytic Converters and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.