My sister used to drive a TT 300zx. DAMN it was quick. just light mods, fmic, exhuast, boost controller etc.
Overheating is a big issue due to the size of the engine bay, and manual gearboxes in the 300zx are shit house, need to shift pretty easy. Other than that, with a sweet veilside kit and some fat rims, i would take one over a GTST anyday, over a GTR well thats a different story!!