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I was thinking about buying another roll of Raamat for sound insulation in the floor to keep out some road noise, from Highway driving. Will this make a difference? Are there any other materials that you would use for insulation? I have 3 layers on the doors, 1 layer backseat side panels, and one layer under the back seat. I was impressed when I put the first roll down and was wondering if another would make a noticable difference. What other areas should I cover when I get my car apart? Thanks for the help.

 
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well Raammat is a sound deadeing matt..not a sound absorbing matt... you might wanna go to http://www.b-quiet.com and get 3 sheets of L-comp..this will do your firewall and floor...it really aliminates alot of exterior noise..

 
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Thanks for the help mohawk