FlatOut Cheats - PlayStation 2
Primary Collection of Cheats
Cheat Mode
Create a new profile and use the following words as a name to enable the cheats:
GIVEALL - Unlocks everything
GIVECASH - Lots of dash
The words will disappear when you select DONE then type in your proper player name and save the profile with the cheats active. There is also RAGDOLL which seems to disable the cheat input.