More than a decade ago, Skunk2s engineers revolutionized Honda performance by creating the first-ever, high-flow, cast aluminum intake manifold. Skunk2*s Pro Series Intake Manifold for most Honda SOHC D-series engines features a larger plenum and oversized runners when compared to the OEM version for maximum horsepower and torque gains. Instead of producing a manifold with a significantly oversized plenum and excessively short runners that would sacrifice mid-range power, the Pro Series manifold was 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. Skunk2*s cast-aluminum Pro Series Intake Manifolds for Honda*s D-series engines are a direct-fit replacement for most D-series engines and are compatible with all factory sensors. Pro Series Intake Manifolds offer horsepower and torque gains greater than competitors* manifolds but without compromising mid-range power output. The design incorporates specially tapered runners as well as a larger, tapered plenum that together preserve mid-range power but increase and accelerate airflow to allow for significant top-end power gains. Pro Series Intake Manifold runner exits are also machined to best match the cylinder head*s ports. Skunk2*s Pro Series Intake Manifold*s shape and design also increases wave scavenging effects at the engine*s ideal operating range, which allow for a broad increase in usable power. Skunk2 is a familiar name in the intake manifold business, with more than 10 years of experience designing, testing, and building them. Similar to OEM manifolds, Skunk2*s Pro Series Intake Manifolds are shell-molded from 356-aluminum, CNC-machined for superior strength, a precise fit, and a high-quality finish, and vacuum-tested for quality. Pro Series Intake Manifold; 66mm TB Opening; Can Be Inlet Matched To 70mm; Mid Range To Top End Gains; Black; Not compatible with OEM D-series throttle body. Must use larger-bore Skunk2 throttle body or similar.; Not directly compatible with Civic Wagon or Wagovan; clearance modifications required.; Not directly compatible with 96-00 Civic; brake proportioning va