Cheats must be typed in main menu, there wont be any confirmation sound:

 European Version:

 GOKARTZ        Little wheels
 BIGHEADZ       Big driver heads
 BOXERZ         Big driver hands and feet
 BIGFOOTZ       Big wheels
 INEEDMORECARS  Unlocks all cars
 MANONTHEMOON   No gravity
 GREASY         Sliding
 GLUED          High gravity
 FONEKART       Secret level
 SPEEDRACER     Fast race
 INEEDMOREMAPS  All maps available
 TERRAFORMER    Map generator available
 IMACHEATER     Enables win button ([Ctrl][W])
 CHAMPIONSAVES  Enables all classes
 TEACHME        Pre instruction screen
 CELEBRATION    Congratulation instead of race

 US Version:

 MONSTERTRUCK   Big wheels
 ROLLERBEARING  Little wheels
 MOONWALK       Low gravity
 FISTFIGHTER    Big hands for drivers
 BALLOONNUTS    Big heads for drivers
 WINBYCHEAT     Enables win button ([Ctrl][W])
 FILLMYGARAGE   All cars
 WORLDTRAVELLER All maps
 KINGOFTHEHILLS Map generator

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 Insane in game key commands:

 [Ctrl][H]      Clouds on/off
 [Ctrl][F]      Fog on/off
 [Ctrl][N]      Mirrors on the outside on/off
 [Ctrl][M]      Mirror on/off
 [Ctrl][I]      Interface on/off
 [Ctrl][J]      (+) Viewdistance
 [Ctrl][K]      (-) Viewdistance
 [Ctrl][Z]      FPS/ping
 [Ctrl][C]      Coords
 [Ctrl][T]      diffenrent views of the map

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 Startcommands for Insane (to be placed with a space behind Insane.exe)

 nomovie         No movies :)
 nofullscreen    runs Insane windowed
 nomouse         No mouse ingame, makes usage of the mouse possible if Insane runs windowed
 nomutex         enables ALT-TAB

 By jot@netbauer.de