RBC Intake Manifold to Stock 2012-2015 Honda Civic Si Throttle Body AdapterFits all 2012 2015 Civic Si Fits all variant models including 6MT, RHD, International Models, Etc. Overview Stock K24Z Throttle Body on RBC RRC Bolt Pattern Intake Manifold K24Z1, K24Z2, K24Z3, K24Z4, K24Z5, K24Z6, K24Z7 Technical Notes: It's no secret that Honda's RRC and RBC intake manifolds are some of the best flowing intake manifolds available from Honda for the K Series engine. RBC and RRC manifold swaps are a popular solution for engines