Originally Posted by bmw8
Lately I've been looking at dyno tests of the M5. Power at the wheels is at 527hp. If an estimated 15% of power is lost at the drivetrain, then the M5's 560hp engine is underrated by about 46hp!!! Does the M5's engine (S63Tu) actually produce 606hp?
Spot on - see http://www.supersprint.com/en/prod-p...v8_2012__.aspx
It actually lists 603hp & 780nm (!!)