You want some more power? aFe's Mach Force XP Cat-back exhaust system produces 11HP and 13 ft lbs of torque for your BMW 335i N55. The Mach Force XP exhaust system is constructed of mandrel bent, 304 stainless steel tubing and uses all factory mounting locations for a easy install with no cutting or drilling required. This system utilizes dual high flow resonators and dual 3.5" polished 304 stainless steel tips and mufflers to give a sporty but not obnoxious tone for your luxury sports car. Dual polished 304 stainless steel dual tips finish off your 335i right.