You are so lucky to have the new NASA chapter there now. I have been running with them for 3 years here in AZ. Sure wish that we had cool tracks like Road Atlanta.
A friend of mine runs a Porche 911 with PCA and has just joined the NASA chapter there. He ran in the race group that weekend and sent me a link with some photos. I saw you in there several times. Here is the address.
http://www.bgphoto.biz/nasa.html
I run in HPDE 4 and was curious what is a good lap time for a cobra at Road Atlanta? The 911 is well prepared and turns 1:42