My '91 does not have plastic sheet door seals - it's the plastic sheet that you usually have to peel back to work on the window regulators or door speakers. I'm in the process of installing new ones - you can actually buy the plastic sheets from Acura. Does anyone know what they are used for? I am assuming it's a vapor barrier of some sort. The previous owner had dyna mat? installed on the door panels - it's supposed to improve the sound. Do you have to remove the plastic door seals to install dyna mat?