Nascar Thunder 2004

Nascar Thunder 2004 cheat codes: 
Dale Earnhardt:
To unlock Dale Earnhardt, win the Daytona 500 as Kevin Harvick (29 car).
After winning the Daytona 500, a Thunder Plate will appear with Dale
Earnhardt on it.

Night tracks:
Go to season mode and then to "Custom Schedule". You can unlock night
races for the day tracks.

Driving locked car part:
In multi player mode, you can drive a locked car. This only works
with one person at a time. Have a player choose their car, then
have the other player go to the same car. Have them change to a
locked car. After that, they can choose their car.