Cheat Easy Mode
Use PASSTHETEST as a profile name to unlock all mini-games and events will be
slightly easier. The words will disappear when you select DONE then type in your
proper player name and save the profile with the cheats active.

Unlock Everything
Create a new profile and use the following 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.

PS2 Cheats for FlatOut

FlatOut cheat codes

FlatOut cheats