Here is some more info on the Pentosin with some track usage in a supercharged twin. I don't track my car...it is a daily driver, so I can't speak on track usage myself. The only thing that has come close for me is a blend of Redline MT-90 and MTL. You may have good luck with Redline MT-85.
http://www.ft86club.com/forums/showthread.php?t=45452