PRL Honda / Acura RBC / RRC Intake Manifold to Stock 2012-2015 Honda Civic Si ThPRL HC9 IM STK Description Application: Stock K24Z Throttle Body on RBC RRC Bolt Pattern Intake Manifold K24Z1, K24Z2, K24Z3, K24Z4, K24Z5, K24Z6, K24Z7 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 equipped with less desirable intake manifolds like the 2012 2015 9th Gen Honda Civic Si,