The new Audi Magazine (I just received it ,anyways ...) has an article on the Champion Racing RS6s. Their 0-60 time is 2.8 seconds!!! Faster than the Vipers and the Vetts and about anything else. Cheers to Quattro.Gone in 2.8 seconds!
When I saw them race at Lime Rock, they just blew away the competition on the straightaways, then gave it back in the curves.
I read somewhere those RS6s only weigh about 3,200 pounds. Impressive.