BEST mod for that car, is get some GOOD driver training.
Jim Russell, Derek Daly, Bondurant, Skip Barber, Roos Racing, etc. Or BMW Performance Center 1 or 2 day Car Control, or M School.
You will get more out of the car by tuning the driver than you can get by hardware mods.
'95 Alpine M3 LTW
'00 Dakar M Roadster
'02 Topaz M3
Red/White SRF #4 (Chassis 561)