Professional Products Whirlwind intake manifold is designed after the popular Acura/Honda Type R manifold with some additional improvements. The plenum chamber has been lengthened to provide additional volume when used with a supercharger, turbo or nitrous upgrades. Nitrous bosses are located on the underside of the manifold. Available in a highly polished show version or a standard satin finish. Whirlwind manifolds also feature a 65mm inlet and additional vacuum ports. The Whirlwind Manifold for Honda/Acura is intended to be the ultimate street performance manifold. Unlike fully built racing manifolds, bottom end power is retained.