I guess I forgot to tell which ones I have owned, although most of you already know:
1984 733i
1991 750iL
1991 318is (Dinan Stage II, Zender, Racing Dynamics Strut Braces front & rear)
1997 Z3 2.8
1998 M roadster (Dinan Stage II, Koni Adjustables, Dinan Electronics upgrade, Dinan Carbon Fiber insert Strut Tower Brace, Racing Dynamics pedals, UUC Short Shifter)