OBX Stainless Steel Turbo Flange - T3/T4 Turbo 5 Bolt Pattern w/ Wastegate Hole T304 Stainless Steel 1/2" Thick 1" External Wastegate Hole Fit T3 (5 Bolts) Turbo Outlet High quality stainless steel for best durability Precision Computer CNC machined cut for smoother flow Best quality and price on the market Comes With OBX Life Time Warranty