Does it display it in game and online on all cars I ever get or how does it work?
Any help would be appreciated
Yes you need the iFruit app. You have to pay at the chop shop to see it on other cars and I assume the online chop shop would be the same way. It only appears on Franklin's Bravado by default as that is the car you mod in the app. For some reason though I had picked the old 60's style Black with Yellow lettering plates but it gave me the default current style California plates so I had to pay at the chop shop to switch it.