I think it would be good to add a bunch of other different types of cars and tuning parts. This means things like trucks, low-riders, old cars, etc. For the tuning, I think you should be able to customize not just one whole color, but different parts of the car. Also, it would be interesting if you could add spoilers, change the rims and other things like that to your car. I think that the current cars should stay as donator, and maybe make the newer higher class cars donator as well, but cars like sedans and some trucks could be available to non-donators at a pretty good price.