I found this stuff by accident while building some home speakers. There are a few products listed, and I've installed the vinyl sheeting into my doors by sticking it onto the panel under the inner door panel. It was easy to form around speakers, door handle, and mirror control wiring and sticks well once ready to put in. The claims made are good news, and I can say that both my wife and I noticed a real difference in the cab at any speed. Except when accelerating and a nice sound of a diesel running well at cruise my '01 is as quiet inside as our '98 Crown Victoria. Best of all the materials are CHEAP!
http://www.partsexpress.com/webpage.cfm?webpage_id=3&SO=2&&DID=7&CATID=48&ObjectGroup_ID=37
http://www.partsexpress.com/webpage.cfm?webpage_id=3&SO=2&&DID=7&CATID=48&ObjectGroup_ID=37
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