While at the Start Screen, press L, R, L, R, L + R, Z.

Unlimited Turbo and Shield

While at the Start Screen, press L + R, Z, L + R, Z.

Unlock All Teams and Tracks

While at the Start Screen, press L, L, R, R, Z, Z, L + R + Z.

Unlock the StarCom Team

Beat the XG Career Mode.

Get Twice the Money

While at the Start Screen, press L, R, Z, L, R, Z, L + R.

Unlock the Extreme Lap Challenge

While at the Start Screen, press L, R, L, R, L, R, Z, L.

Faster Start

Hold forward during the countdown and then hit Gas right when it says 'Go!'.