INTAKE MANIFOLD Unlike all-out racing manifolds, this street performance manifold increases horsepower while maintaining good bottom-end power Range: 2000 to 8000 RPM Uses all factory sensors The ultimate street performance manifold! Similar to the popular JDM Type R manifold but with additional built-in improvements! Plenum chamber has been lengthened to provide extra plenum volume when used with your supercharger, turbo or nitrous setup...;allows more flow for more horsepower. Nitrous bosses are located on underside of manifold. 65mm inlet can be bored larger if desired. Vacuum lines are relocated to back of engine for a clean under-hood look. Works with factory or aftermarket throttle body. For Acura and Honda with B16A Type "B18C-5" DOHC V-TEC engine. Not for use with GSR head.