All drag tracks:
Press Right, X, Left, R, X, L, White, Black at the main menu.

Unlock all drift tracks:
At the main menu, press Right, Right, Right, Right, Left, Black, R, White.

Unlock all sprint tracks:
At the main menu, press Up, Black, Black, Black, R, Down, Down, Down.

Drift physics:
At the main menu, press R, Up, Up, Up, Down, Down, Down, L.

Unlimited turbo:
At the main menu, press A, B, Y, Y, A, A, B.

Unlock all circuit tracks:
At the main menu, press Down, R, R, R, Black, Black, Black, X.