There is currently no sound effect to the Chainsaw in Dayz.
This item seems to be only on community servers and it's almost a silent raid. Just go up to the walls and cut them down in silence. The frames will have to be shot through or blown apart but still doing a good bit of damage silently. There should be a sound added to it.
Also, can we get a feature to Rev it up and use to attack zombies rather than only having the option to use when we walk up to gates/plank piles?