Cheat mode:
Enter one of the following codes: 

Code        Effect         
DFGY       All cars  
ERDRTH     All tracks  
CVCVBM     All quick race tracks   
OCVCVBM    No quick race tracks   
QTFHYF     Shorter tracks   
OPIOP      All challenges   
OPOIOP     No challenges   
FFOEMIT    Disable checkpoint times   
NOEMIT     Enable checkpoint times again   
RFGTR      Stop The Bomber mode   
AKJGQ      $6,000,000  

Stop The Bomber Mode:
Catch all the speeders in Paris, Rome, New York, Hong Kong and London to get this
mode.

Honda Bike:
Type your name as honda xr to get the bike.