The cover and diffuser pipe can be arranged in 4 different ways (inlet top or bottom and left or right) ensuring it will fit most applications. All interfaces are ‘o’ ringed to for easy rebuilds and all bolts are outside the plenum for engine safety. The plenum can be fitted onto 4 separate throttle bodies, a pair of TB bodies or used with any combination of manifold, spacers and a single SFG throttle body.