I have an 03 325i with sport package. So far I have tinted the windows, yeah that weak and had Dinan put the initial software upgrade in it. For anyone considering a software upgrade, I say go for it. Better gas milage and throttle. It also helps that the top end limit has been removed. I hope to have the CAI done before spring and maybe an exhaust before the end of next summer. Oh yeah I added a pedal set. I am of the mind frame that BMW's are a work of art, so I don't want wings or body kits. One other mod would be a strut bar.