Once again…
Because you re-stat cars in updates you have to be able to re-upgrade them. My suggestion is that you car redo you upgrades on each car once for free.
For example: I have won a prize car that has crazy low handling, very low 0-60 and decent MRA. Obviously a good drag car for short races. In a update you change it’s handling to rather good and suddenly it can be a good track car but as a drag car it’s only good in short distances. I want to have it 323 or 233 but cannot even get a second one because it’s a prize car. And even if it wasn’t, because there are more and more cars, the chances of getting that specific car is getting smaller.
I think this is a big issue that needs to be dealt with. More and more cars are getting more or less useless because of this!