I keep seeing conflicting reports on 0-60 sides with the M6 convertible. I know BMW said 4.1 or 4.2.....but then another magazine had it at like 4.8. I don't see how it is as fast as the M6 coupe with the extra 500 pounds.
As for the 55....I have seen 0-60 times at around 4.8 too.....but supposedly the new SL63 is doing 4.4?