Pro Series Intake Manifold For K20Z3 Honda Civic Si 06-11 Acura TSX 04-08 K24A2Pro Series Intake Manifold For K20Z3 Honda Civic Si 06 11 Acura TSX 04 08 K24A2 Product Description: Our 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 our 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