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Kent
I removed my old dirty nasty pad and stripped most of the firewall down to bare metal (I had to weld in new steel in areas). Then I primered it with epoxy when I did the car, then I put on two layers of a Dynamat-type material. Then I painted the engine bay base coat/clear coat with rest of car. I cut the new sound-deadening material using the old pad as a template. Inside the car I lined the back wall and floor with 1/2" thick Armaflex sheet insulation, which is available at HVAC supply houses. This combination gives good sound deadening and insulation.
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