Skunk2's engineers went back to the drawing board when they set out to improve the already popular '06-'11 Civic Si's RBC intake manifold. Each of Skunk2's Pro Series Intake Manifolds for Honda's 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 oversized plenum and excessively short runners that would sacrifice mid-range power, Pro Series manifolds were designed for the street enthusiast who wants more power but doesn't want to sacrifice mid-range performance to get it. The results are improved airflow, an enhanced venturi effect, and both mid-range and top-end power gains.
Ideal for turbocharged and naturally aspirated applications.
72mm throttle body opening can be port-matched up to 76mm.