Skunk2 Racing B-Series GSR Pro Series Intake ManifoldEach of Skunk2s Pro Series Intake Manifolds 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