Dynamat is good, it comes in different thicknesses. Also check the wiring for the 6x9's if you still have them hooked up. Sometimes the connector will sit in an area that it will rattle. Other than that start tapping around back there to see if you can find a rattle. If not, yeah, some dynamat should work well. Just make sure you check out the rear speakers.. grilles and all. If it's not the license plate that's usually what it is.
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