I just stuffed a metric buttload of dynamat in my zippymobile: from the bottom of the folding rear seat all the way back, with two layers in places, and large squares inside the doors and behind all speakers and under the carpeting in the front. Aside from the doors sounding different when they close the noise level is only slightly reduced. Did I do something wrong here? Did I fail clean the srufaces well enough? The car is a Y2K WS6 Trans AM.