Without giving people any idea where to go to get the tools it is now possible to mods saves on the PS3. Tried last night to see if it worked and it did. I won't be using modded stuff in multiplayer it just ruins the fun.
Give the Unkempt Harold 5-4 Torgue Shotgun Barrels.
Four Torgue Shotgun Barrels = 72 projectiles
Five Torgue Shotgun Barrels = 90 projectiles
The Unkempt technically fires 7 projectiles with one, so...
72 * 3 = 216 ammo used per shot
90 * 3 = 270 ammo used per shot
72 * 7 = 504 projectiles per shot
90 * 7 = 810 projectiles per shot
Lets take one that does 17525 damage.
504 * 17525 = 8,832,600 damage per shot*
810 * 17525 = 14,195,250 damage per shot*
*(if they all hit the same target lol)
I think it might work like that...anyway.
Tl;dr: The Torgue Shotgun Barrel can make pretty much everything more awesome in terms of modding. Or it can make them crash your PS3 upon firing them.