aFe Twisted Steel Racing Headers with Cats - E46 M3
Headers with high-flow metallic cats improves power and reliability on track
aFe E46 M3 racing cats have been dyno'd at 15hp and 14ft-lbs gains! aFe metallic cats are constructed with 3" 304 stainless steel tubing, 400 cell metallic catalytic converters, TIG welding, and CNC-machined thick flanges for long life, easier installation, and durability. All factory O2 ports are included for factory or wideband O2 sensors.
The factory catalytic converters are made from a ceramic material that is very good at scrubbing pollutants but may break down and fail at the higher sustained temperatures commonly seen at the race track. These cats use a metallic substrate that is rated for higher temps yet is open enough to improve power and torque while still catalyzing the exhaust gases.
Notice of Fault Codes/Check Engine Light - Using any Racing downpipe could result in a check engine light and fault codes, even with sport cats. Although we have heard of cases where no check engine light appeared, these Racing downpipes are not designed to meet emissions testing and regulations. Race software that is specific to your mods is strongly advised to better adapt your car to a racing environment, keep the fault codes from appearing, optimize power gains, and improve general drivability. Our Epic Motorsports Race software is strongly encouraged to meet all of your tuning goals.
Notice of Emissions Non-Compliance. This product is intended only for racing vehicles that may never be used, or registered or licensed for use, upon a public highway. Removing, disabling, or altering emissions equipment on a pollution-controlled road vehicle is illegal. Installing devices or software that trick, disable, or modify emissions controls and monitors on a pollution-controlled road vehicle is also illegal. This product is sold only for racing, competition, track, hobby, or other off-road use. It's use is prohibited in any motor vehicle that is subject to emissions inspection or control. It is not legal for installation or use in California on any pollution controlled motor vehicle. It is not legal for installation or use on any pollution controlled motor vehicle in any state, province, or jurisdiction governed by, or which has adopted, CARB or EPA regulations. BimmerWorld may confirm a customer's racing license, entry, or track participation and reserves the right to cancel part(s) that are not for legitmate racing or track purposes. Some suppliers have shipping exceptions to certain states or territories, requiring extra delivery time. We will advise you of any delays.
E46 (99-05) > M3
E36/7 / E36/8 Z3 (96-02) > Z3 M - S54
E85 / E86 Z4 (03-08) > Z4 M