aFe 49-34078-B MACH Force-Xp 3 IN 304 Stainless Steel Cat-Back Exhaust SystemaFe 49 34078 B MACH Force Xp 3 IN 304 Stainless Steel Cat Back Exhaust System Testing: In testing, the cat back exhaust system produced a max gain of +13 horsepower and +24 ft. lbs. of torque verified by aFe Powers in house dyno. Aggressive Sound: Dual free flowing mufflers are used to absorb high pitch tones producing a powerful sound and unleashing all available horsepower and torque. Exhaust Valve: This cat back exhaust system incorporates factory