Cheats:

 To enter a cheat code, first go to the Save Game screen. Select Slot
 10,  type in the cheat code and press [Enter]. You can use multiple
 cheat codes together.

 NOAICARS  No AI racers in the LAN game
 STICKIER  No 3D collisions (you can still spin each other but your
           cars will not leave the ground)
 AARDVARK  All collisions turned off
 ITSLATE   No special effects (3Dfx version only)
 CREDITZ   Show Credits with cool pics
 SRACLLA   Unlock All Cars
 LEVELLLA  Unlock All Tracks
 SPAZZY    Test Drive on Acid
 BANDW     Black & White Mode
 MIKTROUT  BIG Cars
 MPALMER   Mini Cars
 GONZON    Fast Forward Mode
 GONZOFF   FF Mode Off
 BIRDVIEW  View From Above
 NITROXXX  Use the Horn to increse Speed
 COLOUR    Turns b/w mode back to colors

 Effects unknown:

 ASTIDERC, TSTIDERC, DSTIDERC, MASTER, BOBCRED