AFE 49-48075-B MACH Force-Xp Hi-Tuck Cat-Back Exhaust System (Black Tip) for 18-24 Jeep Wrangler JL 3.6L V6. 2-1/2" 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.