Brings ambient air temp cool and high velocity pressure ramair from76mm / 4" Z3 or Z3M Ramair vent to engine room, just add hose in between. Fits all Z3 models from 1.8 to all Z3M Models when using cone filter, or aftermarket carbon fiber airboxes. Positive intake sound and eagerness compared to stock airbox. Very good for 1.8 to 2.5 engines. From 2.8 especially with cams there is notable upgrade with 4" version, and much notable ramair effect at speeds.
