It’s not unreasonably pessimistic to say that just because a car is in Gran Turismo PSP, it may not be in Gran Turismo 5. It’s been debated in our forums at length, and we won’t have a definitive answer until we can directly compare the car list from each game. However, things look a bit brighter when you consider this recent interview with Kazunori Yamauchi by French gaming site JVN. When asked about the “interactivity” between GT PSP and GT5, he responds:
“If [the user] unlocks a car in GranTurismo PSP, it will also be available in Granturismo 5.
“If [the user] unlocks a car in GranTurismo PSP, it will also be available in Granturismo 5.