More Corvette Nurburgring Info
7:43 at the the Ring for the C6 Z06 (2006 model)
C5 Z06 (2004 model) did 7:56
2006 C6 (not Z06) did 7:59.
You make take this info with any amount of skepticism you like.
The obvious question is why were they able to make the C6 go 16 sec faster than the one in the Sport Auto Test. For that I only have one explanation to offer:
Although all Euro-delivered C6's are said to have Z51 package (better gearing, stiffer springs, shocks, additional fluid coolers), supposedly, a large number of exported C6's are equipped with the active Magnetic shock absorbers that provide better comfort but poorer performance than the sport shocks/springs that are standard on the Z51 in the US. The Sport Auto car could've had this option (similar to PASM).
http://www.digitalcorvettes.com/forums/showthread.php?s=&postid=454018#post454018