Not sure which 2003 BMW Z4 Air Intake Systems are right for you? We have over 69 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Edwin H from Tucson, AZ said, "All I have is the inatke kit, no any other mod. I love it as it is! great intake, I just got one for my E60 M5, looking for gain some real power with great sounds!"