DieselDiner, you said "There are still several improvements I would like to make that will help as a DD but really help on the track. " What do you have in mind?
Also, what was your original suspension when you bought it new? Base model or sports package? And what other M3 suspension goodies have you installed?
Mods-Etc: Quaife LSD w/VAC finned diff cover, M3 Rear SF Bushings, M3 sways & OEM Susp Front/Rear Cmpnt Kits ('cept strut brace), GC Caster/Camber Plates, AC Schnitzer M3 Sport Springs, JRZ RS1 dampers, JBD 100%, Goodrich SS brake lines, non-stggrd APEX ARC-8 18" wheels with Michelin PSS tires (winter OEM 17" wheels and Blizzak LM-25).