In recent testing this Mach Force XP cat - back exhaust system produced 10 horsepower and 9 lbs. x ft. of torque. This exhaust system is constructed out of mandrel bent, 2.50 IN stainless steel and includes MIG welded hangers and OE style band clamps for a simple, leak - free bolt - on installation. A 2.50 IN high flow resonator is used to keep exhaust drone to a minimum while maintaining a sporty sound. aFe utilizes 3.5 IN double wall, angle cut, polished, stainless steel dual tips with an aFe laser etched logo which provides an aggressive yet elegant look.