All cars: Press Up, Down, Left, Right,
R1, L1, Circle(2) at the main menu.
Ferrari: Press Up, Down(2), R1, L1,
Left, Up(2) at the main menu.
2 billion credits in Grand Prix mode: Quickly press L1, L2, Triangle,
R1, R2 at the main menu, then select " Grand
Prix". Note: You must have exactly 15,000 credits before
enabling this code. If used with a different amount, your credits
will be reset to 15,000. You can then exit back to the main menu
and repeat the code to increase it to 2,000,000,000 credits.
Hint: Faster pit stop refueling: Hold R3 during a pit stop for faster refueling.