Mass Back Auto Carpet - What is it and is it worth it Mass backing is an upgraded option that increases sound and heat insulation when added to auto carpet. When replacing the carpet in a car truck or SUV what is the difference between poly and mass backing Mass backing Vs Dynamat.
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1965-1968 All Makes All Models Parts, A4099B24
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1965-1968 All Makes All Models Parts, A4049B31