Hey, I just bought a 1992 325is

, but have no idea what the aftermarket is like for these cars. What is available in terms of bascis like exhaust and intake and more advanced stuff like engine mods and forced induction. Also I'm interested in a new set of wheels and was wondering what rims, and in what size, owners of this car usually upgrade to. I'd like something light weight and not too expensive.
Thanks in advance for your help!