Yet to ascertain the dampening cost. Got 2 full boxes of 3M dampening material. 10 sheets in each box. Will let you know the cost the moment I get the bill. Overall cost 34k with dampening. Will post the break up a lil later once i have it. The default stuff is foam dampening which is very basic. However if you want better ones the cost will shoot up. The dynamat will cost around 2.5 k per door.