I bought 24 SF of Ballistic Hollow Point on Amazon and did both doors, behind the seats, and the wheel wells. I didn't cover every square inch. This product reduces the road noise by eliminating vibrations. The result is amazing. I didn't take decibel readings, but the cabin noise is significantly lower than before.
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Previous Z's owned 77 2+2, 78 2+2, 83, 2008
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