You probably need to first go with CAI (cold air intake), then chip. If you want to go beyond that, dinan has some stuff you should look at. Or, if you feel that you MUST buy a supercharger, it will set you $5000 I believe. I also believe it is not worth it. Here are some links. www.dinanbmw.com www.ecisbmw.com www.turnermotorsport.com www.uucmotorwerks.com