So in a nutshell, S3 needs:
Couple more street cars, V8`s since we already got the normal 4 bangers and GTR versions of them.
NASCAR`s... What can I say more than that?
And Le Mans Prototype vehicles, LMP`s.
Drifters would be happy with the new V8 street cars, NASCAR`ers would be happy and hardcore racers would be happy with LMP`s.