AFE MACH Force-Xp Cat-Back Exhaust System 2009-2016 Audi A4 (B8) L4-2.0L (t)The MACH Force XP exhaust system for the 2009 2016 Audi A4 (B8) L4 2. 0L (t) produced 12 horsepower and 14 lbs. x ft. of torque. This mandrel bent, stainless steel, MIG welded, exhaust system is designed using a race inspired 3 step design (2. 75 2. 50 dual 2. 25) increasing exhaust velocity which improves horsepower, torque and throttle response. The dual exit double walled 304 stainless steel tip gives your A4 a subtle yet aggressive stance. The