I used Dynamat in the '48 2 ton and was very happy with the sound and heat insulation. It is very durable on the floor under the carpet, and it is thin so there isn't a problem with it taking up space. I covered every inch of space I could reach (under side of cowl, inside doors, etc)
Downside is that that you have to plan ahead and apply it carefully. Once it touches the surface, you are not likely to ever move it again. One small spot I was determined to pull off after slipped and touched too soon, only came off after I pulled so hard the paint came off the metal.
It's not cheap, but you what you pay for. I am using it on the COE I'm doing now.

Last edited by Jim Sears; 06/03/2017 1:16 AM.