FlatOut Codes -

All cars and tracks:
Enter GIVEALL as a name. After entering it, you may rename your profile to any desired name.

$40,000:
Enter GIVECASH as a name. After entering it, you may rename your profile to any desired name.

Fire ragdoll:
Enter RAGDOLL as a name. After entering it, you may rename your profile to any desired name. Press during game play to fire the ragdoll.