Dynamat is not all that! I feel Rammat is better and its cheaper and easier to install.
RAAMaudio
I put twice as much Rammat for what dynamat would have cost me for half of what I put in. Plus applying just the deadning material is only half of the job. You should apply the ensolite 1/8" foam over all the areas you deaden and you will NOT have any squeaks and rattles ever! Plus you car will be like a vault inside!
My Z is like a Lexus inside! My aftermarket Exhaust use to drone intill I deadened the car, now it sounds wonderfull and refined inside the car.