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Also got the passenger side footwell trimmed out, ran outta carpet! Now "experimenting" with contouring the back battery cover pad. Have used an insulating material on the back of the carpeting called "Reflectix". Kinda like bubble-pack with an aluminum foil bonded to both sides. Picked it for the non-absorbent aspect, too.
https://www.reflectixinc.com/script/products/product.asp?ID=79
https://www.reflectixinc.com/script/products/product.asp?ID=79