Get Stop The Bomber Mode:
Catch all the speeders in the London, Paris, Honk Kong, New York and Rome Tracks or put in your name as RFGTR

Get Honda Bike:
Put in your name as Honda XR to get the Honda Bike

Get All Cars:
Put in your name as DFGY

Get All Tracks:
Put in your name as ERDRTH

Get Shorter Tracks:
Put in your name as QTFHYF

Get No Challenges:
Put in your name as OPOIOP

Get All Challenges:
Put in your name as OPIOP

Get All Quick Race Tracks:
Put in your name as CVCVBM

Get No Quick Race Tracks:
Put in your name as OCVCVBM

Toggle Checkpoint Times:
Put in your name as NOEMIT to enable and FFOEMIT to disable

Get $$$$:
Put in your name as AKJGQ to get lots of cash