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Best thing to do is to try to isolate where the rattle is coming from. Then address it with the proper material. That can be Dynamat, MLV, 3M automotive insulation, etc. If you take a look at the build logs of some folks, most choose to just add some kind of sound insulation to the rear deck area and some felt/foam to the 3rd brake light. That seems to address most issues with rattling in the rear deck area.
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