its easier to just focus on making the good sounds louder, LOL.
On a side note, I picked up some stuff called "peal and seal" from Lowe's, its some sort of self adhesive heavy rubber with a aluminum foil type backing on it, pretty much like Dynamat or whatever, but 90% cheaper, I put it on the roof and inside the doors of my 65 F100, and it helped a bunch. I think the stuff was originally made as a gutter liner, or to patch metal roofs of something. Don't think for a second that Dynamat, for all the hype, is a 'new' special product for sound deadening.