American trim levels (ripped from 350z wiki)
Base : The entry level, stripped down version of the 350Z.
Enthusiast : Adds some key features that many will want.
Performance : A bridge between the Enthusiast and Touring
Touring : More luxury: leather, Bose, and Navigation.
Track : Designed for the track guru: light wheels and Brembos.
Grand Touring : A blend of luxuryand performance: Track meets Touring.
IIRC all the UK cars were track and touring (aka non-GT and GT). And to be fair to the seller, he probably has been sold a right story from the original owner It might well be a track as it has Brembo and no GT features. Nismo tuning is probably assumed from the badges and 300+HP was probably sold to the seller by the old owner who was just BS'ing them. I think it should have Rays on it though, not sure where they've gone