Maybe there could be different types of car engine? A V4, V6, V8, and a V12. Each one has a different sound, and have a certain limit to how high the power can be! Also they are different sizes and each take fuel faster / slower and have different weight.
Thanks! @SkullsAndCrossbones
@AndrewGarrison
Aaaand Please new wheels with customizable rims. The existing ones are fine for off road cars but It would be nice to have some cool looking for ones for onroad cars