if i could have afforded dynamat extreme i would have used it, I purchased 120 sq ft of elemental designs edead V1 for 120 shipped, which I believe is about 5 times cheaper than dynamat, it's not as thick, and does not stick as well, yet i used atleast 2 layers of deadening in most places, followed by several coats of Edead V3 (a thick deadening liquid that is painted on)
If your friend is interested I have about 50 or 60 sq feet of the mat left, plently enough to do entire trunk including sides, bottom, and trunk lid, plus lots of layers for your doors, and you'd probably still have some extra for radom rattles that you come across. Make me an offer and I'll ship it you