when i watched the extra vids on the 2nd movie they said they usually only have 1 real car that is the master car and doesn't get a scratch on it. that one is real, but then they have 3 or 4 others that are basic inside, but made to look exactly the same, which are used for stunts and things like that, so they get knocked around a lot. you'll probably find that the gt/gtts will be only in stunts in the movie so you wont be able to tell they arent real gtrs