it isnt cheap though, most people go all out a dynamat everything, I bought thier wedge pack, it wasnt a whole lot but If you put it in the right places is works wonders, even with the little that I used I could really tell a difference in rattle and sq of my system. ( i put some on my trunk lid and when you close it you can ever hear it work normally everthing on the trunk lid rattels when you close it, now its kinda of a quit thud when it closes no rattle at all)