1981 733i Performance Parts

Does anyone know a good supplier for aftermarket performance parts? I've found a couple of places buy none go back to 1981. I'm looking for items like exhaust, intake, upgrading the fuel system, etc... Thanks!!

Bavarian Autosports has some stuff at http://www.bavauto.com/

Also, they have catalog as well. Give them a call if you don't see it online.