Twisted Steel Down-Pipe (Street Series)

Regular price$1,789.20
Shipping calculated at checkout.

  • In stock, ready to ship
  • Inventory on the way


  • Includes 200 CPSI catalytic converters
  • Constructed of 3" mandrel-bent, 304 stainless steel tubing
  • Retains Factory O2 Sensor Locations
  • 100% TIG-Welded
  • Thick flanges to ensure a leak-free seal
  • Includes high quality, O.E. style, V-band turbo flanges
  • In testing, this system resulted in gains up to +20 horsepower and +22 lbs. x ft. of torque (Tested on a 2015 BMW M4 (F82) L6-3.0L (tt) S55)

aFe Power introduces the Twisted Steel down-pipes with cats for the 2015-2019 BMW M3/M4/M2 Competition (F80/F82/F83/F87) 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 +20 horsepower and +22 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.

Hassle-Free Installation:
All necessary hardware is included for a hassle-free installation.

Note: Vehicle may require tuning or programmer to eliminate a check engine light.

Race Disclaimer:
This is a Race Only product that is to be used solely for competition, it cannot be used on vehicles that are operated on public streets, roads or highways. 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. To complete the purchase of this item, aFe Power competition acknowledgement/liability release form must be filled out and submitted.

aFe down pipes are engineered and manufactured in our Corona, California manufacturing facility.

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