I want to have the feeling like I have a car collection like in the real world. We shall introduce a separate menu in which all of my owned cars are put into a big hall were I can walk through and have a look on my cars.
If you want to limit because of a potential limited size you could do it for maybe 100 cars. Alternative would be to use a “garage” and create a duplicarion of the garage in case more cars are bought.
Then in this garage it shall be possible to sit in the car as in forza Vista, Rev up the engine and then directly select the car for a race.