I just installed 40 sqft of second skin's damplifier and 9 sqft of luxury liner (about 26 lbs total). The damplifier went in the doors, floor, and rear section and the luxury liner went in the back hatch area. The noise was significantly reduced, but not what I would call quiet. It has definitely increased my enjoyment of the car. If I had to do it again, I would have went with the damplifier pro and luxury liner pro and drop the sound a bit more. The extra 26 lbs was definitely worth it.
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