This MACH Force XP Cat - Back Hi - Tuck exhaust system is constructed of 3 mandrel - bent 409 stainless steel and comes complete with a free - flowing muffler, tubing, OE style bayonet hangers, band clamps and all hardware necessary for a hassle - free installation. The smooth curves and increased diameter of this exhaust system helps remove restriction and keeps exhaust gas flowing smoothly for increased horsepower, torque and improved throttle response. This exhaust produces up to 6HP and 14lbs. x ft. of torque and outflows the factory exhaust by up to 64. This exhaust fits the 4 door Wrangler only.