wana b drifter
The Japanese rule the gt series. You can build up a Accord wagon to outrun a vette Z06 or Viper, but you can't do that with the american cars of the same class. Besides what would happen if you had a '92 Grand Am out run a NSX.

i guess Japan is just really cocky with there racing games.
oh give it a rest allready, it's not like the US deserves any special treatment, why should they?
the game comes from japan, i think it's a little obvious they'll include more japanese cars than anything else, in japan it's very common for people to get their cars in the track, in the US / europe it's not that common.
so if you think about it for a bit there's a reason behind so many japanese models, the culture is there.
Europeans also have a deeper racing culture than the US, even if it's not on par with the japanese. i mean come on, the most popular racing event in the US doesn't even have real corners in them.
maybe when PD gets the time, they'll include nascar cars, they've gone so far as to include drag races, so it could happen (but i seriously hope it's not required to play trough those, i'd quit the game right there

).
i wouldn't hold my breath waiting for that to happen though, GT is sort of the caviar of racing games, nascar would just add hotdogs to go with it.
EDIT:
forgot to add another reason why nascar will probably never be included, it's sort of a racist sport, it's american only and redneck only.
rally on the otherhand is multicultural, same goes for GT and F1, those are world class sports, nascar is no better than the WWF.