All cars and tracks
Enter multi-player mode and select the "Peer To Peer" option, but choose to race alone. You will be able to select any car on any track.

Infinite money
Purchase a used car and choose an "Overall" repair. When completed, the value of your car will be higher than the purchase price and the cost of the repairs. Sell the car, purchase another used car and repeat as needed.

Enter the following code as your name in Create Player mode. You will hear a confirmation sound.

Gulliver
The Porsches are all shrunk down to the size of radio controlled racers and have little antennas.

Smash Up
Using the Skidpad, Destruction Derby style racing - nothing better than that!

Dakar
Tired of Street Racing? Changes car physics and tracks to Rally style.

Fuzzyfuz
Enables cops in quick race (cops may not appear on all tracks: i.e.-Monaco).

yraGyraG
Enables all cars to have 993 physics.

fetherw8
This cheat code makes cars way heavier.