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
475hp track beast
'03 Audi allroad 475awhp daily driver
'03 BMW F650GS Dakar