about 5 threads down , Afe intake, K n N intakes, The m3 typhoon intakes can be modded to fit and doesnt take much modding to fit, these can be grabbed real cheap, or you can go the serious routes....... the CSL intake which you need alpha N mafless management software, or you can go the most expensive route for the most results..... forced induction uses specialist cast intake manifold for pressures, a complete host of other uprated engine parts, Alpha N management, A very large s/c unit capable of flowing 750bhp plus, a stage 1 kit will result in you getting 455+bhp depending on the fuel map used ;-) This kit is specific to the s54 engined cars, its perfect, it turns the z4m into a proper supercar chaser. So as you can see you have both ends of the scales, i have a dedicated s/c thread if you feel this is your route ;-) just search my forum name. hope this helps you ;-)
Byron