All those demos are basicly the game with one or two tracks, a couple of cars and have time limits The Toyota Demo is based on GT4 and has Fuji Speedway plus the Toyota Prius + a concept car The BMW Series 1 is also based on GT4 and had Nordscheleiffe and the BMW Series 1 (duh!) The GT Nissan Edition, if i'm not mistaken is based on GT3, and has the 350Z and it's concept tuning kit designed by PD, and later made avaible by NISMO. Sadly, i don't have any of those demos, only read stuff about them. It was already difficult to get the GT Concept games, and i still haven't found GT Concept 2002 Tokyo - Seoul.
Well I just found it. I'm looking for one of my saturn boot disks and I almost didn't notice it. I did a double take and threw up a picture to ask you guys. I haven't tested it yet.