aFe 49-46231 MACH Force XP 2.5" Hi-Tuck "RB" Cat-Back Exhaust System for Jeep Wrangler Unlimited 409 Stainless Steel Tubing 2-1/2 inch Diameter Mandrel-Bent Tubing Huge 22 inch Muffler For Better Sound Fits 4 Door Unlimited Only Made and Assembled in the USA