Master code:

Up, Down, Left, Right, A.

Disable AI:

Left, Left, Down, B.

Opponents only attack you:

Down, Up, Right.

Infinite nitros:

Right, Left, Down, B.

No nitros:

Right, Left, Left, A.

Unlimited turbos:

Right, Right, A.

Jumping car:

Left, Right, Up, B. During play, press Y to jump.