that usually happens witha corrupted file (happened to me lots with GTR1) If you are using an unchanged copy i have no idea, if you have changed it go back to the original.
R33 Beast i would love one of those new wheels, I broke my old logitek one in GTR1, but can't afford a new one
There is a R32 GTR being made for GTR2 its not released yet but there are a couple of pics there
http://81.101.94.205/auto-art/viewtopic.php?t=9