For Jeep Wrangler JK 3.0L Stainless Steel Header/Exhaust Tubular Manifold Made of High Quality T-304 Stainless Steel with Computerized Mandrel-Bends for Strength and Durability i.e. Maximizing Smoothest High Exhaust Air Flow Rate 6-2-1 High Performance Long Tube Racing Spec. Design, Produces the Most Top End Power Offers the Best Flow Characteristics for the Engine at High Engine Speeds Increase High Flow Air, Instantly Gain 10 -15 Hp. / Tq. Inlet/Outlet: 1.5"(OD)/2.25"(OD) / 10mm Thick Header Flange / 16 Gauge Wall Piping / O2 Sensor Bung and Metal Gaskets Included