Precision Works K Series Swap Intake Manifold Coolant Adapter Plate K20 Manifold On K24 Head RSXPrecision Works K Series Swap Intake Manifold Coolant Adapter Plate K20 Manifold On K24 Head 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 isn't 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