Real world companies?
You would make your newest car, and put it on the market. Your marketing dude would bring up a list of other cars available in the target market and these real-world companies would be among those provided. You'd have your car, some AI created (or however you plan on doing that) cars, and some from Ford, Toyota, Bugatti, whatever. I don't mean full on rendering them in game, but more a still and brief descriptions.