For Ford Mustang/Thunderbird Performance Stainless Steel Turbo Manifold - GT GT350 L SVO Made of high quality T-304 stainless steel alloy for strength & durability Tubular design with equal runners to ensure equivalent exhaust flow rate from each cylinder Computerized mandrel-bended to maximize air flow smoothness TIG welded CNC machined flange for resistance against cracking and wearing Exhaust (Turbo Manifold) Flange: Standard T3/ T4 Flange.