Yea your doors when u take off the door panel there is a thick price of s surrounding the the entire door held on by windshield tape .thisvkeeps sound out and sound in .it also keeps the water from getting on the back of the door.panels .( this plastic is very very important .they at prob through it away .I got rid of my plaStic in my sc400 BUT I replaced it with dyna mat sound proofing WOW!!!!!