Are there American cars faster than NASCAR cars?

In B specs I'm trying to win an American championship that only allows American cars.

I've tried with a Pilot Level 30 and a NASCAR car, but he can't win.

I'm wondering if there is any American car faster (or with more performance points) than the NASCAR cars to use in this race?

The GT5 Cars website lists all the cars in GT5 and allows you to search on particular criteria. Search for cars from the United States and then sort the results by P/W (power to weight ratio).

I'd suggest picking one of the Chaparral cars or one the Ford GT LM cars, as they're MR layout which should handle better than FR.