There's a thread going on over on the Corvette Forum with a guy complaining that a non Z06 Vette was able to keep up a bit more than he expected. It's been deduced that the Z06's advantages over the standard LS3 Couple is greatly magnified at high speeds.

PS I'm getting ready to get some long-tube headers, 160 t-stat, Vararam ram-air intake, and a custom dyno tune on my 09 Vette courtesy of East Coast Supercharging.
Stock this LS3 feels stronger than my SRT6.