Skunk2 Ultra Series Billet Throttle Body to Manifold Adapter - Honda B to Ultra Race - 309-05-0015Skunk2 Racing now offers a solution for installing the installing the Skunk2 Pro Series or Alpha Series B D F H Throttle Body onto the Ultra Race Intake Manifold. The adapter has a 74mm opening with MAP Sensor provision and transitions smoothly to the Ultra Race Intake Manifolds massive 90mm opening. Works with B16, B17, B18, B20, D16, F20C, F22A, F23A, H22A, and H23A throttle body. Features: CNC Machined 6061 Billet Aluminum Anodized for Corrosion