Ditto to what Pete said. I came out to the track to take a couple of Viper owners up on a generous offer for a ride, so I could satisfy myself that a Viper WILL be my next car. I wasn't disappointed and the rides were great.
However, in the interest of total disclosure, there was at least one Z06 out there driving fast enough to keep up with the vipers in the intermediate B group. A yellow one from North Carolina, I rode with him and he was doing a great job.
The MOST fun I had all day was riding in a '00 gray RT/10. We caught up with a 993 turbo by going faster through the turns, then were behind him on the back straight for two totally wide-open runs. The 993 was modified (don't know how much) and VERY fast in a straight line. We were able to draw up on him slowly, and he eventually let us by. I think we were going 150+mph!
Anyway, this was my first experience with some VCA folks and my first Viper rides, and I wanted to thank everyone for their hospitality. I can't wait to get my Viper later this year.