aFe Racing Catless Downpipe - F22 228i, F30 320i/328i, F32 428i

Gain torque, horsepower, and increased throttle response with this downpipe designed specifically for the N20 engine

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The aFe Racing Downpipe eliminates the catalytic converter for maximum exhaust flow on 2012-2015 228i/328i/428i N20 engines. With aFe dyno testing, this unrestricted cat-less N20 DP produced 13hp and 29ft-lbs of torque, and it flowed 287% better than the factory downpipe

The aFe Twisted Steel Cat-Delete Downpipe is a unique 4" tapered design used to increase exhaust velocity and usable torque. This means you get the noticeable benefit of more aggressive throttle response and increased passing power. 

Features include:
  • Lightweight tapered design
  • 100% TIG welded
  • Factory mounting locations
  • Retains factory O2 sensors
  • Uses OE-style O2 bungs
  • OE-style turbo flange
Advanced Flow Engineering (aFe) has a team of engineers, machinists, and production personnel who are true enthusiasts with a strong belief in the products they design. Their collective experience, knowledge and passion ensure the best products on the market. aFe’s result-producing products and attention to detail set them apart from the competition.

Race software from Epic Motorsports is strongly recommended with this cat-less downpipe. Our race software has been adapted from our own F30 328i racing program and the result of years of racing the N20. Additional power and torque gains are realized with our software over only using the downpipe. The Epic N20 race software will also eliminate fault codes and check engine lights that come from using this downpipe with stock software (helping to pass post-race tech inspection).

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.

Not for N26 SULEV engine. If in doubt check the emissions equipment decal on the underside of your car's hood and look for ULEV (N20) or SULEV (N26) designation.

Notice of Emissions Non-Compliance. 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. Legal only for racing vehicles that may never be used, or registered or licensed for use, upon a public highway. Some suppliers will not ship to certain states, requiring extra delivery time. We will advise you of any delays.

BMW Fitments:

2 Series
F22 / F23 (2014+) > 228i
3 Series
F30 / F31 / F34 (2012+) > 320i
F30 / F31 / F34 (2012+) > 328i
4 Series
F32 / F33 / F36 (2014+) > 428i
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