I used Dynamat Extreme in my 370. The whole back hatch area and doors. This is NOT a sound proofer. It is a sound deadener which deadens vibrations. Thus making your audio sound better.
You can add stuff over the Dynamat for extra sound proofing.
Having the Dynamat has made my car quieter I believe and I would recommend it to anyone who is upgrading their audio and play it loud in which interior panels could vibrate.
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