Explain damping mats

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I'm specing out my car stereo, and since I'm wanting to avoid the basscar rattle, I want to put soundproofing in the car. I know the most common way to do this is Dynamat, but that's about as far as I know. Is there anything that's nearly as good that isn't as expensive? How is it applied? Where is it applied?

TIA :)
 
I used PhatMat for my install, and got 100sq ft shipped for $118 and still have 25sq ft left (ford focus: doors inside and out, Floorpan, trunk, trunk lid (boot))

got it off flebay Link looks like $125 now, but still good deal

Only thing that sucks is after you are done your hands look like a smurf (washes off though)
 
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