Can't really compare race cars to the production cars. Motor Trend just retested the Z06 and they state once again that if you will track the Z06, the manual is the better option. Chevy's words, not mine.
"That said, Corvette chief engineer Tadge Juechter recently told Corvette fans the automatic transmission runs hotter and will go into a preservation mode sooner, so he recommends the manual for serious track duty or when the ambient temperature at the track is above 86 degrees."
Read more:
http://www.motortrend.com/roadtests/...#ixzz3Uqhh2uvP