Exhaust Inlet (Turbo Manifold) Flange: T4 Twin Scroll Flange. Exhaust Outlet Flange: 3.25 " Inlet Flange 4.25" Clamp V-Band. Cooling Type: Oil Cooled. Billet Compressor Wheel: Forged billet aluminum CNC machined compressor wheel - High efficiency, fast response, lower fuel consumption, smooth operation.