Hey there!
Wouldn’t it be cool if you could fully customise your car? Then I don’t mean only the paint, but also kind of interior, engine, exhaust pipes, different weels, different kinds of rims. That kind of stuff.
I was also thinking of a radio inside the car, but not the stereo from 3.0. A radio where you put a link from a music video in and it starts playing, and everyone hears it and not only you. Maybe thats an option for possibly a television too, but then there is audio + the video that plays.
There were my suggestions for now, I know that the first part could be really hard, but it would change a lot!