Description This is for a NEW unmodified OEM Honda 2006-2011 Honda Civic Si RBC intake manifold. The best bang for your buck K-series intake manifold. Proven for many years in stock trim or ported to stand against many “RACE” manifolds. Provides mid to high end hp gains. Will require coolant passage to be cut off/modified to bolt on for K20A2/Z1 cylinder heads These manifolds make huge gains over stock RSX/TSX style intake manifolds Throttle body adapter will be required to run wire driven throttle bodies from K-Tuned or Karcepts Coolant passage adapter required to run on K20 cylinder heads like this from K-Tuned after coolant passage has been modified on intake manifold. 2012-2015 Civic Si owners will need to purchase PRL Motorsports RBC manifold adaptor and RBC Injector adaptors to run this manifold K20 Cylinder head owners will find this Hondata K20 thermal intake gasket easy to install along with being a template to cut off the coolant passage K24A cylinder heads can use this Hondata K24A thermal gasket for direct installation! As always with installation we always recommend tuning software to maximize gains from this Intake manifold swap
