World Driver Championship

Unlock all GT2 cars:
At the Teams/Event Select/Save Game/Main Menu screen, press Z, Right, Z, Z, Z, B, C-DOWN, A, Right, START. You won't earn any experience points, and you still need the standard amount of Gold Cups to unlock the events. There will be no confirmation sound and the screen will advance when you press A, but when you go back to the Team Select screen for GT2, all of the cars will be available.

Unlock all cars and tracks:
Begin a new championship game, and enter RACES THE BEST as your name. At the next screen, press Left, Right, Right, Left, Down, Up.

Access mirrored tracks:
Press Z to choose a track 
at the Track Select screen in Quick Race or Versus mode.

Pink cars:
Start a new game in championship mode and enter IGN64 as a name.

Alternate car color:
Press Z at the car selection screen.

Hint:
You can take advantage of the game's nonexistent damage model by selectively hammering your competitors from behind under heavy braking. This is particularly useful when it involves a key championship rival, because you can drop him a number of places down the order, and significantly strengthen your points standing.

Hint:
Pressing Z at the Car Select screen will cycle through a number of different paint schemes. Pressing Z at the Track Select screen will launch the race in Mirror mode (not applicable for Championship events).

Hint:
Choose the bumper cam driving perspective with the rearview mirror to assist in fending off the hard-charging AI cars. The mirror will permit you to block more effectively when saddled with a slower machine.