I don't think anyone local is "tuning" E46 M3's. There are plenty of shops that can dyno it locally though. The best tuning solution for E46 M3's is available through BimmerWorld...
'89 Porsche 944 Turbo LS1
500+hp track beast
'06 Porsche Cayenne Turbo S 521hp daily driver
'06 KTM 640 Adventure