Today, my friend and i installed a layer of dynamat extreme on the rear wall of my 2000 Chevy Silverado extended cab. We covered the whole rear wall, and the 2 air vents that rattled like crazy..... the result was amazing. Now my subs are deeper, louder, and there is absolutely no rattling from the rear wall or vents. worth every penny imo. I was gonna buy peel and seal, but never found it. Even though i paid 70 to do the whole wall, it was worth it totally.