Dynamat vs other

[ChevyCrazy67]

OK I've got to put something on the walls of the cab of my sons truck to keep them from rattling when he cranks his system up. The question is... how good is all the other brands of sound deadener vs dynamat?

I've priced dynamat and a couple more, the problem is I can't find anything I really like locally, and the ones I've found online including dynamat will require buying at least two packs to cover just the back of the cab.

I don't really have a problem buying it that way I just want to cover all my bases and be sure there's not something better out there first.

Any thoughts or comments? what have you guys used?