-TOCA CHEATS - Touring Car Championship
CMGARAGE - Extra Vehicles, found in the two empty garages after the Laguna.
Tank - Horn button shoots weapon and yes, you can destroy
opposition cars with your firepower !
Flexmobile - Rear Wheel Drive, sticks to the road quite well.

XBOOSTME - Weird one this, will speed the game up, in a jerk-o-vision sort of 
way.

CMCOPTER - Helicopter view, that fly's around the circuit. No good as a racing 
mode, but gives you a nice look around the track. When enabled I found only the 
Silverstone track was available. (One Player Mode Only)

CMSTARS - Gives the sky a nice and pretty evening look...
CMNOHITS - Will enable you to drive right through the other cars as though they 
aren't there. A nice little feature to this code is that the opponent cars will 
still react in the same way as normal racing !

CMMICRO - Top Down racing view (as in Micro Machines).
CMCHUN - Go-Kart View (basically in car view has no dash etc, just wheel and 
hands).

CMDISCO - Disco Fog
CMFOLLOW - Film Camera View (One Player Mode Only), basically the camera will 
follow the car from various angles as seen in the DEMO mode.

CMLOGRAV - Low Gravity.
CMTOON - Cartoon Horizon
CMCATDOG - have some cat and dog falling from the sky
CMMAYHEM - Don't exactly know what it does, but it seems the collision is more 
crazy :)

CMHANDY - You can see your hand are bigger on the in car view
JHAMMO - All tracks
CMLOCK - LOCK UP ALL THE TRACKS AGAIN