All bonuses:
Enter "GIVEALL" as a name to unlock all bonuses. After entering it, you may rename your profile to any desired name.

Extra money:
Enter "GIVECASH" as a name to get extra money. After entering it, you may rename your profile to any desired name.

Disable active cheats:
Enter "RAGDOLL" as a name to disable all active cheats. After entering it, you may rename your profile to any desired name.

Put these as your profile name. It will be blank, but the cheat will be in effect. Very easy to put in!

Cheat: Cash:
Create a new player and write "giveall" to unlock everything or "givecash" for money.

Cheat: Extra Money Hack:
This changes a system file; make a back-up before you proceed. Do not e-mail death threats to IGN if you mistakenly alter your FAT.

Open drive:
letter:...flatoutdirSavegameplayer001.sav with a hex editor (Notepad will not suffice for this purpose; you will need an actual hex editor program). Change the value at address 86 (hex) to FF. Save the file and enjoy the extra pocket money.