Link for what I used:Dynamat is super expensive, I just bought a bunch of Amazon basics sound deadener for MUCH cheaper. Haven’t installed yet so I can’t say if it’s good, but the reviews were great. Worth a shot for $30
Amazon Basics Car Sound Deadener, 14.5″ x 10″, (10 count)Pack of 1 https://a.co/d/aMxOnpD
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