this is the link to the supercharger that i want to get for my 03' 2.5i, i want to get some opinions on it before i spend the $400 on it. i probably shouldnt say this but one of my friends has a S2k and told me that it is worth every penny but, i read on another forum that you cant feel the difference. or something like that, apparently, my understanding is that there is little difference in the dyno performance from any bolt on performance enhancer for the Z4. correct me if im wrong but i think that a 1psi supercharger should make a difference but not a substantional one.
http://www.myhotbmw.com/bmw/Ram/Supe..._-_15HP/536749