BMW F8x M3 M4 AWE Tuning Switchpath ExhaustPresenting the AWE F80 M3 SwitchPath Exhaust line up: Full dual 3 CNC mandrel bent configuration Max gains of 20 hp and 31 ft lbs of torque at the crank Proprietary rattle less exhaust valve design Featuring SwitchPath Technology Tip options include 90 or 102mm double walled tips in chrome silver or diamond black, and 96mm stainless steel tips with carbon fiber sleeve Clean, non raspy S55 tone Precision engineered integrated X pipe SwitchPath