For Jeep Wrangler/Cherokee 4.0 Stainless Steel Racing Exhaust Header w/Flex Application: 91-99 Jeep Wrangler/ Cherokee/ Grand Cherokee 4.0L 6-2-1 Design / Bolts to OEM Exhaust 1.5" ID Inlet / 2.125" ID Outlet TIG Welded CNC Machine Flange Increase High Flow Air, Instantly Gain 10 -15 Hp. / Tq.