aFe Performance Downpipe with Cat - F30 340i, F32 440i

Typical Max gains of 20 horsepower and 22 lbs. x ft. of torque

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aFe is proud to introduce the aFe Twisted Steel® Catted (Sport Cat) down-pipe for the 2016, 2017 and 2018 model BMW F30 340i with the L6-3.0L (B58) engine. In testing this system resulted in a max gain of 20 horsepower and 22 lbs. x ft. of torque thanks to the 400 CPSI (cell count per square inch) high flow catalytic converter. When used on a tuned / FBO / car making more boost, the gains are even more impressive. This is thanks to aFe's computer designed lay-out and sport cat, which outperform your restrictive OE BMW catalytic converter by up by over 100%, freeing up gobs of power and torque. 

This high performance downpipe delivers massively improved power as well as better throttle response and a more aggressive and exciting exhaust sound during hard throttle. aFe uses a unique 4" into 3-1/2" stepped design to increase exhaust velocity and the amount of usable torque. They also take advantage of heavy duty 3" 304 stainless steel flex tubes with internal interlock liners. This down-pipe and sport cat installs in the factory location, mounting directly to the factory mount points and includes hardware for a hassle-free install. It's 100% TIG-welded for strength and longevity. 

Factory O2 Sensor Locations: 

Factory mounting locations for all O2 sensors.

Hassle-Free Installation: 
OE style brackets are included for a hassle-free installation.

aFe down pipes are engineered and manufactured in AFE's Corona, California manufacturing facility.

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.

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:

3 Series
F30 / F31 / F34 (2012+) > 340i
F32 / F33 / F36 (2014+) > 440i

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