F1 Pole Position 64 

Unlimited fuel 
Select Grand Prix mode and set the fuel setting to "10%".

Hidden car 
Beat and save the game as World Grand Prix Champion:
Then, restart the game and hold A + B when the phrase "Please wait while loading" appears.
The '96 Forti drivers will now have the Ubi Soft Original H-RA V12 on the driver selection screen.

Engine select 
Beat and save the game as World Grand Prix Champion:
Then, restart the game and highlight a driver at the driver selecting screen.
Press Left-C or Right C to change the current engine.