Try the Nissan GT-R '07. Or if that's the American Muscle Car races, try a Ford GT. And yes the Ford GT is a nightmare to drive the first hour, but when you've gotten used to it, it's very potent. You also need the Ford GT for a S-class event and it can be used for at least one more S-event.
Just brake in a straight line before the corner and be easy on the throttle when you're turning with the Ford GT and you'll be fine.