Here are the bonus codes, as described from Gamefaqs. I believe that the Exclusive codes relate to cars that can't be earned through gameplay, so I recommend using those. Not sure if Buchbiner or Pagani are exclusives. There is apparantly some codes for an AI Driver and a Repulser, but those are unique if I understand it right.

BONUS CODES

Buchbinder Emotional Engineering BMW 320si
F93857372

Pagani Zonda Micromania
M38572343

(Exclusive) Play.Com - Astin Martin DBR9
P47203845

(Exclusive) Gamestation - BMW 320si
G29782655

(Exclusive) Gamestop - All Muscle Cars
MUS59279

All Drift Cars
TUN58396

I would assume these would work, as they are often mentioned at the Gamefaqs forum, for the PS3, Xbox 360, and PC. The ones listed here should be universal, but it will take me a bit longer to confirm since my download is taking awhile to complete.

The only ones that shouldn't work is the Ebay codes, which are uniquely generated and tied to a specific user. I think you had to go to a certain website to get a code generated, but it might have been discontinued.

I was able to unlock the Zonda, DBR9 and 320si through gameplay. Are these codes different versions of the cars?


EDIT: I think the codes unlock new liveries, and the cars themselves if you haven't unlocked them yet through gameplay.

Did you find out if these codes are universal so anyone can use them, JudasIscariot?

I have used all of the codes listed, and they work. Good times. :)

Both.

Oh, ok, didn't saw the "(Exclusive)" part. Thanks!

All codes worked for me

All codes worked for me, thanks!!!!

I think all those cars can be obtained via regular gameplay. The so-called exclusive codes only unlock specially-liveried versions. For example, see here concerning the Aston Martin DBR9...