Too bad, it would be great if you could jump to higher class by paying cash. Like from class 7 to 8 for 1 million, from 8 to 9 for 2 million or something like that. This way you could drive your favorite car.
Yes this might be it. If you go to your garage you can activate or deactivate an upgrade by clicking on it. Activated upgrades will be in orange color. Make sure your upgrades are activated at the highest stage.