NISMO is NOT for track or anything performance based:
IL Track Tested: 2009 Nissan Nismo 370Z vs. 2009 Nissan 370Z Touring | Straightline Blog on Edmunds' Inside Line
here is where a touring model out performs a nismo and in most cases you find the nismo equal or performing very slightly better, dont let it fool you.
i've looked so much into this whether i want a nismo or base model, here is my old thread before i made up my mind:
Nismo Body Kit