Yes, Smart cars do need keys im not sure about in the futur but now they do for sure.
Need to know what kind of "race car", there are many.
A delorian
well it depends on what kind of car it is, the year, model, and how big the space is in the back.
The car radio back then was to listen to news, music, and entertainment. The same way as it is used today
Drum.
A DeLorean.
Not usually. But it will cause it to overheat. What kind of car?
He has a smart car and a sparkely Blue prius. When nobody's looking, he pees in the back seat.
A 1946 Ford convertible.
Epoxy will do that kind of repair.
No money will be back if you have already the used car. It is also based on each others agreement unless there's some defectives occured in the car before it was bought.