First of all, this car is turbocharged if I can recall. But (and I'm not knocking tuner car fans), the car can perform very well without fancy body kits or race car-like sounds. Actually, I don't think it's an ugly car. I think it's a car in which if you're not a Buick fan, you may appreciate it as being a nice car to race when you're facing some tough American muscle competition. Remember, I think Gran Turismo 4 is trying to reach out to as many car fans as possible, even if it means soiling Japanese car fans with American muscle. Of course, if this were an AOL Chatroom, people would be bashing on Japanese cars like they have no place on Mother Earth. But instead, we have a nice convergence of cars from at least 120+ years. And let's not forget about the "80 manufacturers" deal according to the Tokyo Game Show.
So to make a long story short, the GNX is perhaps the perfect sleeper car. And if you mod it to take down anything modern, you have a wonderful weapon to turn to when you need to take down competition American style.