Car customizations. for example spoilers It would be cool to be able to add spoilers even if they didn't do anything or they did it just a cool aspect, paint jobs, wheels, maybe designs on cars. It would also be cool to like be able to upgrade or buy like new engines for certain cars like imagine putting a V8 engine into your old junky 1990 SUV. also like imagine going to an illegal dude and getting some Nitro tanks added to your car that would be sick. Something that I think maybe people would enjoy is like giving cars LEDs or like being able to change color of headlights.