what speedventures event were you at? I have been at the past few auto club speedway events.
I drive in the black group (black c5z06). Lots of fun, there are some M3s on here with slicks that give me quite a run for my money even though I weigh half a car less than them.
I also found out today that the pilot sport cups the '12 vettes are running these day have an 80 tread wear rating. Absolutely insane if you ask me.
Also, this may be weird, but were you at chuckwalla about a month ago? I met a guy there that had an r8, gt3 (I think it was a gt3 but i forget), and a scud. Very similar to your lineup.