[Rshane]

Setting aside most of the variables that give slightly different readings from one dyno to the next, I have noticed a trend of around 330-340rwhp on average for the M3's, which doesn't really add up to 414hp at the crank...however, trap speeds and quarter mile times seem to indicate at least 400hp.

My 03 Cobra dyno'd 372rwhp stock, which was about the norm for that model car, and it was rated at 390hp...really putting down around 425 at the flywheel. That car ran 12.77 @ 111 bone stock and weighed in about the same as the M3 (3650lbs for the Cobra) and my 05 GTO put down 355rwhp and was rated at 400.

I personally believe the car has the power, it just puts it down "strangely"...maybe gearing has something to do with it...who knows. I don't really care about dyno's too much anymore, actual performance numbers are better IMO.