Lancia Y: 90/100
I'm not normally a fan of the FF or Kei cars, but this one's an exception. I've tuned it to let the rear wheels loose under heavy acceleraton, and it's one of my favorite FF cars out there. Yes, it's only 208hp when topped out, but it's really a lot of fun. A real underdog against ~493hp races. I give it high marks for it's overall impression, obviously it could never compete in the GT300/GT500 championships.
S2000GT1: 75/100
I have a hard time getting this one tuned to my liking. It's a tough-looking car with lots of power, low weight, and quick reflexes. Too quick, I feel. No problems winning, but I have trouble making this car handle as smoothly as I'd like. Maybe it's the short wheelbase, or maybe I'm not the true champion I think I am...It also seems to chew through tires very quickly in the enduros.
How about the Audi S4?