I went to the NQS Autocross at Marshalltown this weekend, and all I can say is I have a lot to learn about driving RWD on a track. My best run was 1:23 and change, the vid I have is a 1:24 time and going a little sideways from too much throttle out of a turn (happened a lot, I need to learn more right foot control). A stock c5z was running 1:21 times and a few new Boss 302 mustangs were in that range too I think.
http://www.youtube.com/watch?v=nroVHPoVt_8&hd=1