Nascar Thunder 2004 Cheats

Chose any track and press cursor keys on the keypad
until it appears that you are upside down. Drive and it will still
look as if you are upside down when in fact you are actually level.
Press [Keypad 5] to return to normal.

Instead of reaching the EA Bio levels for the All-Star race and the Shootout, just race a season on veteran at 3 or more % race length, damage on visual only, and brake and steering help, and win the races.

To unlock all create-a-car sponsors, win the Winston Cup in Career Mode and you'll get a thunder plate that states all create-a-car sponsors are unlocked.

To unlock Kitt Paint, win the Winston Cup in Career Mode.