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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 here in the UK on our CNC vertical machining centre, and are therefore ready to fit straight onto a Civic Type R EP3 or Integra Type R DC5. This is one of the best inlet manifolds available for the K20A engine and it out performs most other manifolds through the whole rev range. With ecu tune this manifold can give +15BHP. To fit this to your original K20A/K20A2 you will also need an adaptor plate (for the throttle body) which we also sell.