I bought 2 bulk packs of dynamat xtreme and 1 trunk kit and no matter what I do, it still rattles like crazy by the trunk area. I double layered almost everything in my car since it is really small. Roof, doors, floorboard, wheel wells, bottom trunk, side walls of trunk, liscense plate area, and of course the trunk lid. (I got 2 bl's on a gp3000d-pro). When your running a lot of power, there will always be rattle no matter what. The dynamat did help immensely of course. Without it, I wouldn't have a trunk lid no more lol.