Its called the Redline Time Attack series. Anyone can enter their car and get clocked on the course. Its pretty sick theyre using a new Zoomius timing system that does sectors like Formula 1 races. It would be sick to enter into it to get clocked. Heres an article speedtv did on it.
http://auto-racing.speedtv.com/article/gt-redline-time-attack-prepares-for-2010/
http://auto-racing.speedtv.com/article/gt-redline-time-attack-prepares-for-2010/