Paul,
While I think the supercharger will ultimately hurt the zr1.. I dont think it will be as bad as you do.. For one interesting reason.. The IC is huge.. IF you have to lose 100 bhp to be equal to the z06.. thats alot of tweaked timing. Couple that with the carbon brakes and bigger tires, and I dont think the z06 stock will be the better track car. Modded is a whole other story.
Here is the dyno run of the new zr1.