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Dreamcast - 4X4 Evolution cheats

Get $1 million
Note: You need a Dreamcast keyboard to activate the following cheat
Connect your keyboard and use the D port. 

During gameplay, type the following cheat code: "goldfinger"
If you typed the cheat code correctly, you should hear a sound.

After, type another cheat code: "givememoneyordie".
If you typed correctly, you should hear a sound also.
Exit the race and you should have 1 million.

Get $32,000:
Complete the all city series

$1 million:
Complete the all endurance races

Hidden tracks 
Motocross: 
Drive over the hill in front of the 11th checkpoint. 
On the other side is a small circle track. 

Savage Wasteland: 
At the beginning of the race turn around and face the wall part of the wall 
has a different look, and can be smashed through. Plow through it and follow 
the power lines.