HONDA K20A DC5 EP3 RBC INLET MANIFOLD - OPTIONSDo you want to upgrade your inlet manifold on your Honda K series engine but would like to keep the engine bay looking very original , then this is the best inlet you can buy! The Honda RBC Intake Manifold. The famous RBC manifold is a genuine Honda part. However straight out of the box it needs modifying and will not fit the K20. Ours are modified in the UK on a CNC vertical machining centre, and are therefore ready to fit straight onto a Civic Type