18 inch wheels will work on the Gen III car with a bit of modification to the e-brake caliper, very simple.
Stoptech rotors will save a nice amount of weight, and are very expensive. Perforated is not of choice for track guys, and this was from the horses mouth, Stoptech, slotted is preffered.
As far as rotational weight savings, well it's there, but not so much benifit as if it were on the outermost of the rotor.
Check out the projects page on my site about the all aluminum rotors. I will market these very soon, and the weight reduction is great. They will have a steel friction surface on them, and will not warp, or fail as they have been tested exstensively.
www.provipermods.com
Skip White
ps, John, whats the deal on reducing bump steer? Does the Viper produce much of it on lift, and how are the rotors a factor. Fill me in please...