This is definately an easy DIY. Most of the cost is labor so just take an afternoon and do it yourself.
I got Buzzmat from my stereo installer and put it in myself. Then to top it off I stuffed some Roxul Safe'n'Sound into the voids behind the plastic trim. It made a huge difference. I only did the trunk and it good enough for me. If you do the work yourself it is easy enough to do it in steps till you decide what it is good enough. Don't however expect to get Lexus or Mercedes level of silence in your car it ain't going to happen.
My logic on the mat is acts as a deadner(dampner) to reduce the vibrations coming thru the skin of the car and the Roxul acts as a sound absorber. Anyways all I really know is that when I run through a puddle it dosen't sound like the water off the tires is coming right into the cabin now.
I would guess that whether you use Dynamat, Buzzmat, Boom-mat or whetever I doubt you could tell the diffference. they are all more or less the same a tar like substance on a foil backing.
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