^
FatMat makes good stuff - it's all in the install. I've seen people with Dynamat Extreme all over their trunk, but it still rattled like hell because they either A) Didn't install it properly, or B) Didn't put in the correct areas. When a spot rattles really bad, you sometimes have to put 2 or 3 layers on to stop it. And if you dont put the material on to the exact contours of the mounting surface, it doesn't do it's job.