drifter444 said:Do I need to buy the transferable cars in order to transfer them from forza 3 to forza 4?
Yes, they must be in the garage to count.
Izayoi said:So will I be able to import the pre-order Unicorn from FM3 after I've already imported my driver level, or do I have to wait to play Forza 4 until they send me the code?
No, profile import is a 1 time event. So what you have in your FM3 profile gets transferred and credited. After that, you'll have to get it in FM4.