I ended up using e-dead V3 by elemental designs.

http://www.edesignaudio.com/edv2/pro...products_id=54

I believe I used almost 4 gallons with 2-3 coats thru most of the interior (including around/behind dash).. This was about 2 years ago so I'm a little fuzzy how much I used. Needless to say the results were excellent. Sounded almost as quiet as my friends older model bubbly lexus SUV. Could've made it even more quiet using a few extra coats but after removing all the paneling/carpet/dash I was in no hurry.

I spent a few months researching all the various sound dampening products. I wanted the best bang for the buck as I wasn't gonna waste a huge amount of money on something as silly as sound dampening material.

E-dead was eventually what I settled on. Most of the people that seemed to really have a good grasp on acoustics would repeatedly suggest liquid sound dampening products and e-dead especially. There was another in the same price range but essentially comprised of the same chemistry. Many of the numbers I would read and test results pointed to liquid dampeners being the superior type of sound deadener for in car use.

Pretty cool they sell it in black now, used to be only available in blue.

Certainly seemed much easier then dealing with dynamat, brown bread, and the like. I can only assume most people shy away from liquid deadeners due to their permenancy.. But after you apply the stuff trust me, you're not gonna want to remove it. EVER.

Just remember after all the fancy properties these so called sound dampeners have, the only real way to block noise is with MASS.