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Watch this vid:http://www.youtube.com/watch?v=u7eIF4cgFx4It's a heck of a lot cheaper ($16 a roll). Dynamat is ridiculously over priced. You pay like $150 to do a 3 foot section. Or something like that. Google B-quiet for another good alternative to dynamat, that one's actually made for autos.
I used some stuff that I got off of e-bay called fatmat. Like Armor said I could not be happier with how it turned out. It is like the dynamat, it is sticky on one side and after installed it cut out the noise and cut down on the temperature in the cab.