Yep, Epic is the company I was thinking of, they work very closely with BimmerWorld. Apparently with a good set of headers, the AFE stage 2 intake, BimmerWorlds 3.5" exhaust and an Epic tune you can hit 340rwhp with an E46 M3...
'89 Porsche 944 Turbo LS1
500+hp track beast
'06 Porsche Cayenne Turbo S 521hp daily driver
'06 KTM 640 Adventure