Skunk2 Pro Series 06-10 Honda Civic Si (K20Z3) Intake Manifold (Race Only) (Black Series)Skunk2s engineers went back to the drawing board when they set out to improve the already popular 06 11 Civic Sis RBC intake manifold. Each of Skunk2s Pro Series Intake Manifolds for Hondas K series engines feature larger plenums and shorter, oversized runners when compared to the RBC, and are cast with thicker wall material, leaving room for further porting for high horsepower applications. Instead of producing a manifold with a significantly