First, no, i didn't edit the game files, nor used a trainer.
I was driving it normally, and decided to get a 8C Spider. Went on, bought it and tuned it. Did some races and decided to return to the F458.
Instead of going to one of my houses, I entered a A2 Single Player race, changed to it and got out of the championship. Didn't bother looking on the specs. Only when a buddy told me that o noticed what happened. The car now is level 3, just like my 8C. i tried to reproduce the glitch but no luck. Because of that, its the only car i refuse to sell/trade.
I've been using it on mp races without problems, but only against friends. I don't need anyone going around claiming that I'm cheating when they don't know what is going on.
I've also submitted a report on tdu2 site, but noone seemed to bother with it.
So far, to me, it seems that like TDU1, the game has the tuning files for Ferraris. Maybe its something that all cars need to work on game, despite them being locked or not.
Anyway, if anyone feels like this is fake. My TDU2 screen name is organiczero. Hit me up and I'll show you the car.