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I really don't think the original pad did much for noise, more for blocking heat. If I remember the thing was made of some kind of rubber with what looked like asbestos fiber material stuck to it. Whatever it was I agree the thing probably trapped water against the firewall. I had enough rust to deal with back there. I've seen the firewall stripped clean and painted and it looks nice. If it seems noisier or hotter inside the car, put some additional insulation under the panel behind your seats.
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