Ross Machine Racing 90mm Throttle Body is precision CNC machined from solid billet 6061 aluminum with a black anodize finish and Ross Machine Racing logo. Featuring M8x45mm screws and washers, and pre-installed cable mounting bracket, the throttle body offers superior durability with its 1/2" split stainless steel shaft and needle bearing with seal design to handle high boost without breaking. It has a 90mm diameter blade and total thickness of 2-1/2 inches, and is available in standard Mustang CW or CCW rotation with 4" hose connection or compatible bolt-on adapters. Perfect sealing ensured with pre-installed 4" o-ring in front and back.