aFe Power’s introduces the Twisted Steel down-pipes with cats 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. In testing, this system resulted gains up to +21 horsepower and +23 lbs. x ft. of torque. These down-pipes use 200 CPSI catalytic converters and includes all components for a hassle-free installation.
Dual High Flow Catalytic Converters:
Dual 200 CPSI catalytic converters are used for maximum flow.
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 1: This system is not currently CARB exempt and is not available for sale in California or for use on any vehicle registered with the California Department of Motor Vehicle.
Note 2: Vehicle may require tuning or programmer to eliminate a check engine light.