aFe Power's introduces the "Race Only"Twisted Steel down-pipes for the 2015-2018 BMW M3/M4 (F80/F82/F83) with the L6-3.0L (tt) S55 engine. The down-pipes are 100% TIG-welded and constructed of mandrel-bent, 3", 304 stainless steel tubing with thick flanges to ensure a leak-free seal. This high performance race pipe delivers pure, race-inspired raw power and also produces an aggressive and exciting exhaust sound during hard throttle.
100% TIG-Welded by certified craftsmen for race proven strength and durability. TIG-Welding provides the strongest welds reducing stress cracks.
Factory O2 Sensor Locations:
Factory mounting locations for all O2 sensors.
All necessary hardware is included for a hassle-free installation.
aFe down pipes are engineered and manufactured in our Corona, California manufacturing facility.
Note: This system does not include catalytic converters and is a "Race Only" product used solely for competition. Its use is limited to closed-course and open-course racing that is formally sanctioned by a recognized racing organization. Any other use including recreational off-road use could be in violation of local, state and federal laws. A check engine light will emit and aFe recommends using a programmer but it is not necessary.