Pro Series intake manifolds offer greater power and torque gains than rbc classics without compromising power at mid-revs. The design incorporates pipes similar in length to RBC but with larger bores. Its design and larger conical plenum, retain power at mid-revs but increase and accelerate the airflow for a greater power gain. The shape and construction of these manifolds are best suited for Honda cylinder heads and wave-sweeping effects in the ideal operating range of the engine. Specific to the Skunk2 brand, pro Series intake manifolds are molded into shell (similar to OEMs) from 356 aluminum and CNC machined. The precise and optimal finishes sharpen the design and quality of the product both inside and out, crowned with the Skunk2 Authentic nameplate.