Forza Motorsport 3:Unlock Cars in Free Car Packs

Hy!
I Downloaded the free car packs for Forza motorsport 3.
There are the free cars,and another cars in the pack, like the Devon GTX,Gumpert Apollo S,Mosler MT900s, ...., .....
Maybe some of you know that,and have the same free car packs

So these cars are blocked,you can´t buy them,until you buy the hole car pack!.

-Is there any way to Unlock the cars?
-or maybe to get the Cars directly using a mod?

If there is a Way to get blocked cars please tell me!

i say thanks!


P.s my english isn´t that good!