If you want proven performance gains, more ground clearance and sound from your Jeep JL 3.6L 2 or 4 door, this Mach Force - XP cat - back exhaust system is what you need. 2 - 12 mandrel - bent 409 stainless steel tubing and 14 high flow muffler improves exhaust flow for increased horsepower and torque. In - house dyno testing resulted in gains of up to 9 horsepower and 8 lbs. x ft. of torque and delivers a noticeable exhaust tone. The Hi - Tuck designed tailpipe tip gives you extra clearance during extreme angle climbs or descents and an Old School traditional Jeep look. Factory - style hangers, ball flange connection and quality hardware are included for a hassle - free install.