I never like to race unless I have all the cars I've wanted, and now I do and so can you, I have been playing this game for a year and I used these three cheats to obtain actully very nice race cars for the PlayStation 2's graphic ability, and here they are.
Like always, in career change your name to the following, after done you can change it to what you had before or whatever you want; it's your choice.
If you like the Fantasy Driver's (Not my favorites) here is the cheat to get them, make your first name "Race" and your last name "ThePack" this will unlock all fantasy driver's.
If you want the Chase Car's, make your first name "Checkered" and your last name "Flag" now you should have the Chase Cars.
And this one only works if you have obtained your copy of NASCAR 08 from Wal-Mart. Make you first name "Walmart" and last name "EveryDay" and this unlocks the car and their fantasy track.
I hope you found these cheats good and continue to find submitted information by me. If you need any help at all ask me and don't be shy. Happy Cheating.