On my old car I did lots of work to quiet the car's interior, prevent noise and vibrations from entering the cabin, and insulate it from the Florida heat. Here are a few old posts: I posted this up a few years back about the difference between vibrating panels, sound deadening, and sound transmission barriers La-Z-Link Sound proofing the doors and door panels: La-Z-Link Sound control products and their purchasing sources: La-Z-Link
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