SKUNK2 RACING THROTTLE BODY ADAPTER - K-SERIES K20 RBC TO PRBSkunk2 Racing now offers a solution for installing the Grams Performance & Design Drive By Wire Throttle Body or Honda K (RBC) Drive By Wire Throttle Body onto the Skunk2 02 06 RSX Pro Series and Ultra Street Intake Manifolds. A necessity when installing the Ultra Street Intake Manifold on the 06 15 Civic Si. The adapter has a 72mm opening and a 71mm exit as well as a MAP Sensor and 1 8" NPT accessory port for additional flexibility.