The Coiling Maw mounts to the front of The Deuce and provides extra ramming damage. Once the Hammer of Infinite Fate DLC is installed, it becomes available after completing "Doom's Dawn". The player must first purchase "A Touch Too Much Armor" before the Coiling Maw will be available. There is no cost for the upgrade.
Use of the Coiling Maw is required to unlock the following achievement/trophy:
Ran down 20 animals in the Deuce with the Coiling Maw equipped.