All Tracks and Cars:
Start a new game in championship mode and enter your name as "races the best." At the next screen appears press Left, Right, Right, Left, Down, Up.

Change Car Color:
Press Z at the car selection screen.

Access all GT2 vehicles:
In Championship mode, at the GT2 circuit menu, (Teams/Even Select, Save Game, Main Menu) press Z, Right, Z, Z, Z, B, C-Down, A, Right, Start on controller two.

All Sydney tracks:
Remove the memory pak from the controller. Then, start a new championship and enter "FROZENSKY" as a name. Accept an offer from one of the two teams. Once you have accepted, return to the main menu, and select a quick race. Choose one of the race modes, and you should have access to any of the Sydney tracks. Return to the main menu, and insert the memory pak. Load your current career to restore all of your game settings. Save your career. Then when the game is reloaded, all six variations of the Sydney tracks should still be available

Mirrored Tracks:
Press Z button to select a track instead of the A button

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

Red Track Marks:
While Racing Press: B, L, V, D, R, R, R, D on the d-pad.

Get Mirrored Tracks:
At the track select screen press Z to pick your track in Versus or quick race

Custom Car in End Sequence:
Once you finish the GT2 Circuit you will get a GT2 Ending Sequence option in the options menu.

Get Falcon Interceptor:
Finish the game with a gold trophy for all events. Go back and start a novice cup race and defeat the Falcon Interceptor car in the novice cup races. Now it will be available on the Team Select sceen under Boss Racing

Speed trick:
Start the game normally in any mode.
Select manual transmission.
Accelerate your car over 100km/h.
Then turn your car to reverse and hold it reverse.
Your car starts to accelerate very fast.
You can reach over 400km/h speed but your car is hard to control.

Tracks:

Las Vegas CR Track:
Use the Stallion C car to win at the Hawaii A Track (2 laps)

Sydney CR Track:
Use the Manta C car to win at the Las Vegas A Track (3 laps)

Hawaii C Track:
Use the Rage C car to win at the Lisbon C Track (3 laps)

Kyoto B Track:
Use the Swift C car to win at the Lisbon CR Track (4 laps)

Kyoto AR Track:
Use the Rage A car to win at the Hawaii C Track (2 laps)