As far as I heard it on the teamspeak the admins are still working on this. In race07 it is probably not as easy to integrate new cars / classes as in e.g. GTR2 (by modifying the class files). You have to create a new, extendable selection-screen and make it work in the game. Up to now nobody succeeded in doing this, so the Bude is once again a "pioneer". Relax and be patient, I'm quite sure we will get addon cars as soon as all things are sorted out.