This cat-back was designed for maximum ground clearance and performance. The 2.5" mandrel bent stainless steel tubing is located to the chassis using bayonet style hangers and band clamps for a hassle-free installation. All MACH Force systems come complete with a free flowing muffler, 409 stainless tubing, bayonet hangers and band clamps. Constructed of 2.5" mandrel bent 409 stainless steel tubing for maximum flow Smooth transition bends allow for low turbulence, increasing horsepower, torque and improving throttle response A straight through designed, free-flowing stainless steel muffler is used to absorb high pitch tones High quality OE style flange and band clamps are used for a complete 360-degree sealing surface eliminating leak paths Fits Jeep Wrangler Unlimited (TJ) 04-06 I6-4.0L