I think, people need something like new cars, or maybe car modifications. New interiors or more realistic engine, skids sounds. Small improvements can make wonders, I think. For example, if you add the option to select from 3 sport steering wheels, 3 types of rims or make the virtual player in internal view move his hand while changing gear (like it is in cross rally championship 2005). Great improvement could be to add petrol and diesel engines in the game. Petrol engines with power in high rpm and diesel models that accelerates from low rpm.

Thank you