i did that too. I have 2 layers of extreme dynamat. 1 layer of trunk bed liner. and some 3M rubberized undercoating. It still rattled till yesterday. One of my friends told me to put some silicon in between the rear bumper and the actual car itself. Especially by the license plate. So I did and it works. Not to mention a big screw fell out from behing there when I took off the bumper.
Matt
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