Originally Posted by bruce.augenstein@comcast.
In any event, it's wise to not take them up on it, even if you're on a limited-access open road with no traffic around, because:
A) In cars like these, throw-the-key-away speeds are only seconds away.
B) You're almost certainly going to lose.
Couldn't have said it better myself. C63 drivers do this because they know they can embarrass M3s in a straight line.