1 B3
2 M3
3 C63

article: http://www.auto-motor-und-sport.de/tests/vergleichstest/hxcms_article_510006_14055.hbs?ext_site_number=1

scans from another board:
http://www.m3post.com/forums/showpost.php?p=2245392&postcount=6

0-160 km/hr
M3 9.9
C63 10.3

curb wt
M3 3540
C63 3967

payload:
M3 1036
C63 873

the M seems larger in most interior dimensions

The B3 is a great alternative to the M3 and the performance dynamics might be better as an everyday driver. No idea yet though, if it will even be exported to NA.
Greg

Curb weight M3: 3,540. Heck yeah. Do some weight reduction on the car such as lightweight battery, carbon airbox, lightweight exhaust, trunk accessory removal, etc.... and the car will be right around 3,400. I can live with that!

Hell, that's the E46 curb weight but with 80 more horsepower and a 7 speed! :shiftdriv