Making the S55 sound great. Again. Presenting the second generation AWE Exhaust Suite for the BMW F8X M3 and M4: Unified design for OPF euro and non-euro spec cars (2015 - 2020 fitments confirmed) 50-state legal catback design: sick sound with all catalysts intact Precision-engineered X-pipe to unlock a clean S55 tone Available as valved SwitchPath™ or rowdy Track Edition SwitchPath™ utilizes factory valving and retains M-Sport button functionality 3” CNC mandrel-bent catback configuration Max gains of 12 hp and 16 ft-lbs of torque at the wheels Track Edition comes complete with AWE machined mechanical valve simulators Tip options include 102mm double-walled, slash-cut tips in chrome silver or diamond black Handcrafted from U.S.-sourced .065" wall T304L stainless steel Proudly engineered, designed, and manufactured in-house at AWE No Check Engine Light guarantee Perfect Fitment guarantee Featuring the AWE Lifetime Exhaust Warranty