I realy can't wait to see the reviews of the 13gt500 and the zl1.
It realy isn't all about horsepower. Check out car and drivers lightning lap results from last year.
http://www.caranddriver.com/features...-4?redirect=no
The zr1 was 1.7 seconds quicker, in basicaly the same car, only difference being the 133hp and 130 tq difference.
I'm sure in a straight drage race, it would be a different story though.