Even a mild tune will take the C6 Z to the high 400's to the wheels. We do not know what tune is on this Z06 or if it even has a tune at all. There is absolutely nothing to back it up, no dyno numbers, no tune named, nothing. Not to mention this is likely some cheap canned tune as the options in Europe for proper Z06 tuning do not remotely compare to what is done in the United States.
The Z06 is the faster car here but the car appears to be shifted very slowly. F10 M5 owners will no doubt get excited over this video and think they can now hunt down tuned Z06's. We strongly advise them not to get ahead of themselves as a properly driven tuned C6 Z06 will embarrass them.