Their seems to be alot of confusion between the performance of a healthy running V6 SHO, and a healthy running V8 SHO. In my V6, I would lay waste to every generation STOCK 5 speed (& auto) Maxima's (ALL very healthy cars, and much better drivers then myself), EXCEPT for the 3.5 6 speed Maxima (02 - 03) I believe, that put several football fields on me from a roll (in my ATX). A healthy running V8 SHO will perform equally or better. As for the GTP, you'll know how YOUR sho stands against it when you do decide to race him.
FWIW, I've put 3/4's of a (front bumper at rear fender) car length on a healthy running V8 SHO (second set of coils, and plugs, and meticulous maintenance w/ 80K miles) from a dig several times in all types of condition. From a roll, he would always walk away.