Built from heavy 400 stainless, replaces crack-prone stock piece. Easy bolt-on installation. Thick 1/2-inch flange is double welded, machined dead flat and precisely fitted to resist warping and cracking. With more power, quicker acceleration and tougher construction than ever, the Banks TorqueTube for the Jeep 4.0 liter out muscles any competitive exhaust manifold: period! Made from super-durable, mandrel-bent 409 stainless steel tubing and sporting a 1/2 inch-thick precision ported and machined flange. Powering through the roughest terrain is no longer a question. And cracking... a thing of the past when you arm your Jeep with Banks TorqueTubes. Key Features Virtually indestructible 100 percent Stainless Steel Mandrel-formed tubes tune exhaust flow for maximum torque Maximize exhaust extraction Flanges welded on both sides, then milled flat Seamless high-velocity collector Pulls exhaust and slashes backpressure Heavy 400 stainless replaces crack-prone stock piece Bolts on 1/2 inch thick flanges won't warp or flex US Patent #6,634,171 B1