Quote:
Originally Posted by COcyclist
I have a belly pan and didn't notice any noise reduction. I removed the back seat, spare and parcel shelf in my hatchback for about 100 lbs of weight reduction in the VW. The downside was INCREASED noise. I added another 11 lbs on Dynamat sound deadener and still my wife would rather not ride in the car with the back seat out because of the tire noise.
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Makes sense, as dynamat is a vibration dampener. The seat, shelf, and spare were better at blocking noise than dynamat is. To block noise, you need a decoupled mass loaded barrier. Something like mass loaded vinyl, separated from the metal by closed cell foam, or lead with closed cell foam on both sides.