Special Car:
To get special cars type in SPDSTR when you do a time trial. 

Note: This will only work for 1 player games.

Codes:
Go to the first OPTIONS menu and type:

     cup of choice --This unlocks all cup races! 
     that takes me back --This enables backwards mode! 
     i have the key --This unlocks all cars and tracks! 

*NOTE: Where the spaces are you must hit the space bar* Other Cheat

To use these codes you must be fast enough to have your time entered on the high score screen (make sure to turn checkpoints
on from OPTION screen.)

     knacked - Reverse tracks 
     whoooosh - Nitros (press HORN while racing) 
     mjcim.rc - Tiny cars 
     sausage - Bonus cars 


Note: After entering the codes make sure you save your game. Otherwise, you will have to run this each time you play.
Also, if you use the Nitro code don't try it until you're in second or higher gear. Otherwise you'll spin out.