Need For Speed: Porsche Unleashed

At the credits screen, quickly press Right, Left, Up, Down, Circle, Square to enable cheat mode and unlock all cars and tracks in quick race mode.
If you entered the code correctly, you will hear a sound.
Enter the code again to disable it.

Modern era 
Enable cheat mode, select evolution mode, then enter "BEEM" as a name.

Golden era 
Enable cheat mode, select evolution mode, then enter "BEEG" as a name.

Mission 6 and GT2 car 
Enable cheat mode, then enter "PALF" as a name.

Mission 9 and 917K car 
Enable cheat mode, then enter "PALI" as a name.

Bonus cars 
Do well in the various Test Driver modes to unlock bonus cars, such as the GT2 race car and the 917 race car that can be used in regular race mode.

Game music 
Play track two and higher of the game disc in an audio CD player to hear music from the game.