The ZL1 ran a 7:41.27 at the Nordschleife. A Corvette C6 Z06, with DOT competition tires and the Z07 package, ran 7:22.68. I'm betting the Z/28 ought to turn a 7:33 -- which would make it one of the fastest cars per dollar at The Ring...
"This is the most barbarically analog car on the planet." ~ Ezra Dyer/Automobile Magazine