DeutschTuning proudly offers aFe MACHForce XP Stainless Steel Catback Exhaust System BMW M3 (E90) 08-13. This system is constructed of 2.50" diameter, mandrel bent, TIG-welded, 304 stainless steel, brushed finish tubing and uses all factory mounting locations for an approximate 1 hour install time. In recent testing, this exhaust system produced 12 horsepower and 11 lbs. x ft. of torque. This race inspired system is 15 lbs. lighter than the factory exhaust system and utilizes race tested and proven 3" carbon fiber quad tips to withstand extreme temperatures and weather conditions. This unique exhaust system uses 2.5" diameter 304 Stainless Steel that is TIG-welded and has a hand brushed finish. Race tested and proven, carbon fiber quad tips are used for weight savings and a sporty look. The dual mufflers consist of a single in, dual out, free flowing design, giving an aggressive sound at high RPM s, yet maintaining a subtle tone at cruising speeds. This system uses factory mounting locations providing stability and hassle-free installation with no modifications necessary. 304 Stainless Steel. Carbon Fiber Quad Tips. Dual Mufflers. Uses OE Mounting Locations