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