Chevy/GMC C/K Serise High-Performance 2-PC Stainless Steel Exhaust Header Kit Made of High Quality T304 Stainless Steel Material TIG Welded CNC Machine Flange Increase High Flow Air, Instantly Gain 10 -15 Hp. / Tq. Inlet: 1.5" / Outlet: 3" / 3-Bolt Flange Comes With Metal Gasket, Reducers & Bolts