The Godfather - 5000

Full ammunition:
Pause game play, then press Circle, Left, Circle, Right, Square, R3.

Full health:
Pause game play, then press Left, Square, Right, Circle, Right, L3.

All movies:
Pause game play, then press Circle, Square, Circle, Square2, L3.
Nastyy13 and SuperAyato24.

Unlimited ammunition and 1 million:
Reach the "Don Of New York City" rank at a 91.5 game completion.

Easy Mob Wars:
After you have finished 100 of the missions, you will need to destroy the other four family compounds. This is difficult because if you die, you need to start over. After you destroy one, save your game at the nearest safehouse. This will help you because if you die, you can load your game and go back to after you destroyed the rival familie's compound.

Extra ammo:
In the beginning of hells kitchen chapter, after you get the bomb, go downstairs. Yuo will see 2 guys mugging a chef. Kill the two guys and talk to the chef. Follow him, he will open a door where you can get ammo.

Extra cash:
To get extra cash just wander around town and search for a man trying to do a purse snatching. If you kill the man he well give you 3000 dollars or less. This is more likely to happen during the night time.