No Rider
     Ok first get a bike. Then crash the bike and make your rider fall
off.  Once the rider is off, hit start. Then unpause it. You will have
no rider on your bike! May take a couple tries.

Ghost rider
     This  works  on career mode and multiplayer mode, but if you have
unlocked  the  Cohette which is the motorcycle, go to any one of those
modes and chose the Cohette as your vehicle. Then if or when you crash
press start and wait a couple of seconds and then go to continue race.
Instead of a guy with a helmet on your bike you will have an invisible
ghost rider.

Drive with a completely wrecked car
     Just  blow  yourself  up and pause it before the game resets you.
Now  unpause.  Your car's components will now be as bashed up they can
be just like if you blew up. Doing this also keeps you from blowing up
as easily, a real help in races. To get your original car back, simply
either  run  into a gas pump or start the race over. This cheat should
work in all modes.

Smart Bike Glitch
     When  racing  with  a  motorcycle, crash. As soon as you do press
start  then  continue race. Your guy will be off the bike, but it will
still ride.

Change Difficulty Settings
     Highlight  "Options  Mode", then press Down to highlight "Option:
Cheat  Codes"  and  press  X.  Then,  enter one the following codes to
adjust the difficulty level of the game:

howhardcanitbe0 (Easiest) 
howhardcanitbe1 
howhardcanitbe2 
howhardcanitbe3 
howhardcanitbe4 
howhardcanitbe5 
howhardcanitbe6 
howhardcanitbe7 
howhardcanitbe8 
howhardcanitbe9 (Hardest)

Unlock Paris cop car
     Win all circuit races in Paris with Arcade Mode.

Unlock LAPD car
     Win all the circuit races in LA.

Unlock Tokyo cop car
     Win all circuit races in arcade mode in the Tokyo city.

Unlock SLFA50X
     Come in first place in Tokyo, LA and Paris in arcade mode.