For Mazda RX-7 Stainless Steel T4 Turbo Manifold - FD FD3S Made of High Quality T-304 Polished Stainless Steel Alloy Material for Strength and Durability Tubular Design with Equal Runners to Ensure Equivalent Exhaust Flow Rate from each Cylinder TIG Welded CNC Machined Flange for Resistance against Cracking and Wearing Increase Engine Exhaust Output and Efficiency 44mm/ 46mm External Wastegate Port and Flange Included; Standard T4 (T04) Turbo Flange Configuration Outlet