Skunk2 Racing now offers a solution for installing the Skunk2 Pro Series or Alpha Series B/ D/ F/ H Throttle Body onto the Skunk2 K series intake manifold w/ RBC style flange. Commonly refereed to as K to H manifold swap. The adapter has a 68mm opening as well as an 1/8" NPT port for additional flexibility. Works with B16, B17, B18, B20, D16, F20C, F22A, F23A, H22A, and H23A throttle body. Features: CNC Machined 6061 Billet Aluminum Anodized for Corrosion Resistance Mounts to Honda RBC/ RRC Flange 68mm Opening 1/8" NPT Port Gasket and Hardware Included Notes: Used with the following Skunk2 Intake Manifolds: 307-05-0320307-05-0325 Complement your B to K Throttle Body Adapter with a Skunk2 K to H Intake Manifold Adapter.