aFe MACHForce XP Exhaust 3in SS Dual Side Exit CB w Black Tips 15 Ford aFe MACHForce XP 3in 304SS Cat Back Exhaust s Black Tips 16 17 aFe MACHForce XP 3in. 304 SS Axle Back Exhaust For 08 13 BMW 135i L6 2 aFe MACHForce XP Exhausts Axle Back 15 21 BMW X1 2.0L (t) (SS w Black aFe MACHForce XP Exhaust 3in SS Dual Side Exit CB w Black Tips 15 Ford aFe MACHForce XP 2.5in Axle Back Stainless Exhaust w Polished Tips 07. The Mach Force XP cat back exhaust system produces 11 hp and 10 lbs. ft. of torque. constructed from 2. 75 in. mandrel bent 304 hand brushed stainless steel and utilizes a unique crossover pipe that helps to equalize exhaust pressure and tunes the exhaust pulse. Comes with dual 3. 5 in. polished 304 stainless steel tips and muffler to build a mellow yet powerful sound. Engineered and manufactured in our Corona Ca manufacturing facility. All systems use factory mounting locations providing stability a nd hassle free installation. High quality band clamps are used for a complete 360 deg. sealing surface. A free flowing muffler is used to absorb high pitch tones producing a powerful sound and unleashing all available horsepower and torque. The crossover balance tube equalizes and evenly distributes exhaust pulses traveling through the exhaust system. This not only creates more efficient flow and better performance it also reduces sound decibels ultimately minimizing exhaust drone. This Part Fits: Year Make Model Submodel 2008 2013 BMW 135i Base