Originally Posted by ILC32
One more data point: 650i weight: 3814 lbs; M6: 3909.
There's that M weight-saving magic at work!
Yep, good point. Even with the carbon fiber roof they can't keep it under the weight of the 650i. Not sure how the two car compares in features though - the M6 might have more standard features although that is just a guess.
It will take some serious measures to keep the M3 under 3600 lbs.