K-TUNED K24 INTAKE MANIFOLD ADAPTER - (COOLANT ADAPTER)The K24 Intake Manifold Adapter is a simple and easy way to install K20 style manifold on K24 heads. The recirculation fitting on K24s is typically part of the intake manifold which isnt on K20 intake manifolds. We have designed the adapter to work with all K24 heads including the K24Z Series (R40) heads. This can also be used to install K20 manifolds or cut RBC manifolds on 9th gen Civic si as the water bypass is slightly different and you will not