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    BMW E46 Catalytic Converters

    Our Catalytic Converters are the same quality construction as OEM but at a third of the cost! These are a direct replacement for the original BMW catalytic converter. These bolt on to your stock exhaust manifold and muffler, no welding required. We offer cats for both pre-OBDII BMW's (pre 1996) and BMW's with OBDII (1996+). We offer both 50 state legal converters and less expensive 49 state versions. Meets all EPA and CARB requirements. A factory warranty is included: 5 year/25,000 for 49 State versions, and 5 years/50,000 miles on 50 State legal versions.
    You're currently viewing parts for your (E46) 3-Series 1999-2005. Reset your chassis
    For accurate results, specify your year and model below.
    50 State Legal 400 Cell Cat

    Front Exhaust Manifold Catalytic Converter

    This catalytic converter is a direct fit replacement to OEM, but at a third of the cost. No welding required because these bolt on to your stock exhaust manifold and muffler. Backed by a manufacturers warranty - 5 years/50,000 miles. Legal in all states including California. Manufactured by Magnaflow. This is a 400 cell catalyitc converter which is hiigher flowing & better performing than the 600-900 cell OEM catalytic. Replaces BMW part number 11627503673.

    This item fits the following BMWs:
    1999-2000 E46 BMW 323i 323ci 328i 328ci
    1999-2000 E39 BMW 528i
    1999-2000 Z3 BMW Z3 2.3, Z3 2.8
    Part #: 56175-M
    Price: $859.24 (USD) 
    Quantity:   
    50 State Legal 400 Cell Cat

    Front Exhaust Manifold Catalytic Converter

    This catalytic converter is a direct fit replacement to OEM, but at a third of the cost. No welding required because these bolt on to your stock exhaust manifold and muffler. Backed by a manufacturers warranty - 5 years/50,000 miles. Legal in all states including California. Manufactured by Magnaflow. This is a 400 cell catalyitc converter which is hiigher flowing & better performing than the 600-900 cell OEM catalytic. Replaces BMW part number 18407514502.

    NOTE: If you are seeing catalytic converter efficiency codes we recommend checking for vacuum leaks before replacing the catalytic converter. A common cause of vacuum air leaks is a faulty crankcase ventilation system. E46 models use 11617534237





    This item fits the following BMWs:
    2001-2005 E46 BMW 325i 325ci 325xi (M54)
    2001-2005 E46 BMW 330i 330ci
    2001-2002 Z3 BMW Z3 2.5i Z3 3.0i
    Part #: 56287-M
    Price: $859.24 (USD) 
    Quantity:   
    50 State Legal 400 Cell Cat

    Rear Exhaust Manifold Catalytic Converter

    This catalytic converter is a direct fit replacement to OEM, but at a third of the cost. No welding required because these bolt on to your stock exhaust manifold and muffler. Backed by a manufacturers warranty - 5 years/50,000 miles. Legal in all states including California. Manufactured by Magnaflow. This is a 400 cell catalyitc converter which is hiigher flowing & better performing than the 600-900 cell OEM catalytic. Replaces BMW part number 11627503936.



    This item fits the following BMWs:
    1999-2000 E46 BMW 323i 323ci 328i 328ci
    1999-2000 E39 BMW 528i
    1999-2000 Z3 BMW Z3 2.3, Z3 2.8
    Part #: 56176-M
    Price: $859.24 (USD) 
    Quantity:   
    50 State Legal 400 Cell Cat

    Rear Exhaust Manifold Catalytic Converter

    This catalytic converter is a direct fit replacement to OEM, but at a third of the cost. No welding required because these bolt on to your stock exhaust manifold and muffler. Backed by a manufacturers warranty - 5 years/50,000 miles. Legal in all states including California. Manufactured by Magnaflow. This is a 400 cell catalyitc converter which is hiigher flowing & better performing than the 600-900 cell OEM catalytic. Replaces BMW part number 18407514503.

    NOTE: If you are seeing catalytic converter efficiency codes we recommend checking for vacuum leaks before replacing the catalytic converter. A common cause of vacuum air leaks is a faulty crankcase ventilation system. E46 models use 11617534237



    This item fits the following BMWs:
    2001-2005 E46 BMW 325i 325ci 325xi (M54)
    2001-2005 E46 BMW 330i 330ci
    2001-2002 Z3 BMW Z3 2.5i Z3 3.0i
    Part #: 56288-M
    Price: $859.24 (USD) 
    Quantity:   
    Special Pricing! These HJS metallic sport cats for the E46 M3 fit in place of the stock US factory catalytic converters in the header. These are high-flow 100cpsi cats so you get a performance and horsepower improvement while still retaining a catalyst. This makes it perfect for race or track cars that require a 'factory-style' cat in the rules. This Supersprint metallic cat/header is welded to the stock manifold after cutting off the stock cat section.

    Supersprint exhaust is widely recognized as the leader in complete exhaust system upgrades - extremely high quality, well designed for optimal flow, and amazing sound. Even at a premium price Supersprint is an unbeatable exhaust system because every aspect is done to such a high level. A Supersprint exhaust rewards you with a terrific sound, long lasting construction and excellent fitment. The Supersprint sound is very 'European' which fits the sporting sophistication of BMWs perfectly. Most systems are also modular - sections can be added or removed to custom tailor the exhaust sound to your preferance. Aside from 'Race' systems, their mufflers meet European noise laws so you get a refined and tuned sound without being excessively loud. Most Supersprint systems are built with larger diameter piping to improve exhaust flow which helps the engine do less work and make more horsepower! Supersprint exhausts generally run at a premium over other systems but no other system on the market can match their quality, performance, or reputation!

    Supersprint metallic sport catalytic converters are sourced from HJS of Germany. For 30 years HJS has been supplying motorsports teams with sport cats when rules required them. HJS is now a worldwide leader in sport cat technology and performance. Rally cars, German DTM, and Formula 3 all rely on HJS for clean, reliable horsepower. Supersprint works closely with HJS to spec a catalytic converter that is correct for the vehicle and engine package. This allows for a substantial increase in flow but which, at the same time, keeps the environmental specs within European limits. With any high-flow catalytic converter, special software or other work may be required to keep emissions fault codes and check engine lights from displaying. Supersprint catalytic converters are sold for track and other off-road uses only.

    section: manifold downpipes with metallic sport cats
    connects to: stock manifold; Supersprint or stock section 1
    material: T304 stainless steel

    This is a race exhaust system which alters or deletes the emissions equipment on your car, and may not meet emissions standards in all states. Because of this, we require a waiver of emissions compliance to be signed and sent in to TMS. You can download the waiver here.

    This item fits the following BMWs:
    1999-2006 E46 BMW M3
    Part #: 044021
    Price: $2,815.95 (USD) 
    Quantity:   
    49 State Legal OEM Grade 400 Cell Cat

    Direct fit replacement to OEM but at a third of the cost. No welding required because these bolt on to your stock exhaust manifold and muffler.Backed by a manufacturers warranty - 5 years/25,000 miles . Legal in all states EXCEPT California. This Front Catalytic Converter is for Bank 1 - Cylinders 1-3. Manufactured by Magnaflow. Replaces BMW part number 18407514502.

    This is an upgraded version from the standard 49 State catalytic converter. It has a higher precious metal content and higher flowing & better performing 400 cell catalytic - versus the 600-900 cell OEM catalytic

    For vehicles conforming to CALIFORNIA (CARB) TLEV, LEV, ULEV, SULEV OR FEDERAL (EPA) NLEV emissons.
    Please check your emissions label to ensure you select the correct catalytic converter.

    This item fits the following BMWs:
    2001-2005 E46 BMW 325i 325ci 325xi - M54 Engine Only
    2001-2005 E46 BMW 330i 330ci
    2000-2002 Z3 BMW Z3 3.0i
    Part #: 49758-M
    Price: $802.12 (USD) 
    Quantity:   
    49 State Legal OEM Grade 400 Cell Cat

    Direct fit replacement to OEM but at a third of the cost. No welding required because these bolt on to your stock exhaust manifold and muffler.Backed by a manufacturers warranty - 5 years/25,000 miles . Legal in all states EXCEPT California. This Rear Catalytic Converter is for Bank 2 - Cylinders 4-6. Manufactured by Magnaflow. Replaces BMW part number 18407514503.

    This is an upgraded version from the standard 49 State catalytic converter. It has a higher precious metal content and higher flowing & better performing 400 cell catalytic - versus the 600-900 cell OEM catalytic.

    For vehicles conforming to CALIFORNIA (CARB) TLEV, LEV, ULEV, SULEV OR FEDERAL (EPA) NLEV emissons.
    Please check your emissions label to ensure you select the correct catalytic converter.

    This item fits the following BMWs:
    2001-2005 E46 BMW 325i 325ci 325xi - M54 Engine Only
    2001-2005 E46 BMW 330i 330ci
    2000-2002 Z3 BMW Z3 3.0i
    Part #: 49759-M
    Price: $802.12 (USD) 
    Quantity:   
    49 State Legal OEM Grade 400 Cell Cat

    This catalytic converter is a direct fit replacement to OEM, but at a third of the cost. No welding required because these bolt on to your stock exhaust manifold and muffler. Backed by a manufacturers warranty - 5 years/25,000 miles . Legal in all states EXCEPT California. We also offer a version that is legal all 50 states including California. Manufactured by Magnaflow. Replaces BMW part number 18307515236.

    This is an upgraded version from the standard 49 State catalytic converter. It has a higher precious metal content and higher flowing & better performing 400 cell catalytic - versus the 600-900 cell OEM catalytic

    For vehicles conforming to CALIFORNIA (CARB) TLEV, LEV, ULEV, SULEV OR FEDERAL (EPA) NLEV emissons.
    Please check your emissions label to ensure you select the correct catalytic converter.

    This item fits the following BMWs:
    2003-2005 E46 BMW 325i 325ci
    Part #: 49760-M
    Price: $594.52 (USD) 
    Quantity:   
    49 State Legal

    Front Exhaust Manifold Catalytic Converter

    This catalytic converter is a direct fit replacement to OEM, but at a third of the cost. No welding required because these bolt on to your stock exhaust manifold and muffler. Backed by a manufacturers warranty - 5 years/25,000 miles . Legal in all states EXCEPT California. We also offer a version that is legal all 50 states including California. Manufactured by Magnaflow. This is a 400 cell catalyitc converter which is hiigher flowing & better performing than the 600-900 cell OEM catalytic. Replaces BMW part number 11627503673.

    For vehicles conforming to FEDERAL (EPA) Tier 0 & Tier 1 emissions.
    Please check your emissions label to ensure you select the correct catalytic converter.

    This item fits the following BMWs:
    1999-2000 E46 BMW 323i 323ci 328i 328ci
    1999-2000 Z3 BMW Z3 2.3, Z3 2.8
    Part #: 50175-M
    Price: $668.84 (USD) 
    Quantity:   
    49 State Legal

    Front Exhaust Manifold Catalytic Converter

    This catalytic converter is a direct fit replacement to OEM, but at a third of the cost. No welding required because these bolt on to your stock exhaust manifold and muffler. Backed by a manufacturers warranty - 5 years/25,000 miles . Legal in all states EXCEPT California. We also offer a version that is legal all 50 states including California. Manufactured by Magnaflow. This is a 400 cell catalyitc converter which is hiigher flowing & better performing than the 600-900 cell OEM catalytic. Replaces BMW part number 18407514502.

    For vehicles conforming to FEDERAL (EPA) Tier 0 & Tier 1 emissions.
    Please check your emissions label to ensure you select the correct catalytic converter.

    This item fits the following BMWs:
    2001-2005 E46 BMW 325i 325ci 325xi - M54 Engine Only
    2001-2005 E46 BMW 330i 330ci
    2001-2002 Z3 BMW Z3 2.5i, Z3 3.0i
    Part #: 50287-M
    Price: $662.30 (USD) 
    Quantity:   
    49 State Legal

    Rear Exhaust Manifold Catalytic Converter

    Direct fit replacement to OEM but at a third of the cost. No welding required because these bolt on to your stock exhaust manifold and muffler.Backed by a manufacturers warranty - 5 years/25,000 miles. Legal in all states EXCEPT California. This Rear Catalytic Converter is for Bank 2 - Cylinders 4-6. Manufactured by Magnaflow. Replaces BMW part number 18407514503.

    For vehicles conforming to FEDERAL (EPA) Tier 0 & Tier 1 emissions.
    Please check your emissions label to ensure you select the correct catalytic converter.

    This item fits the following BMWs:
    2001-2005 E46 BMW 325i 325ci 325xi - M54 Engine Only
    2001-2005 E46 BMW 330i 330ci
    2000-2002 Z3 BMW Z3 2.5i, 3.0i
    Part #: 50288-M
    Price: $662.30 (USD) 
    Quantity:   
    49 State Legal

    Rear Exhaust Manifold Catalytic Converter

    This catalytic converter is a direct fit replacement to OEM, but at a third of the cost. No welding required because these bolt on to your stock exhaust manifold and muffler. Backed by a manufacturers warranty - 5 years/25,000 miles . Legal in all states EXCEPT California. We also offer a version that is legal all 50 states including California. Manufactured by Magnaflow. This is a 400 cell catalyitc converter which is hiigher flowing & better performing than the 600-900 cell OEM catalytic. Replaces BMW part number 11627503675.

    For vehicles conforming to FEDERAL (EPA) Tier 0 & Tier 1 emissions.
    Please check your emissions label to ensure you select the correct catalytic converter.

    This item fits the following BMWs:
    1999-2000 E46 BMW 323i 323ci 328i 328ci
    1999-2000 Z3 BMW Z3 2.3, Z3 2.8
    Part #: 50176-M
    Price: $668.84 (USD) 
    Quantity:   
    49 State Legal

    This catalytic converter is a direct fit replacement to OEM, but at a third of the cost. No welding required because these bolt on to your stock exhaust manifold and muffler. Backed by a manufacturers warranty - 5 years/25,000 miles . Legal in all states EXCEPT California. We also offer a version that is legal all 50 states including California. Manufactured by Magnaflow. This is a 400 cell catalyitc converter which is hiigher flowing & better performing than the 600-900 cell OEM catalytic. Replaces BMW part number 18307515236.

    For vehicles conforming to FEDERAL (EPA) Tier 0 & Tier 1 emissions.
    Please check your emissions label to ensure you select the correct catalytic converter.

    This item fits the following BMWs:
    2003-2005 E46 BMW 325i 325ci
    Part #: 24510-M
    Price: $442.20 (USD) 
    Quantity: