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purchased a rubber seal kit and used it around all four door, and the hood of the car.. made a 1-2db difference.. I also bought the bottom rubber seal from a 5 series and glued that to the bottom of the door and bought the door seal kit off a 7 series, cut and moulded it to my back door frame so when I close the front door its sealed just like on the 7 series, I also sealed off the front quarter panel with a door seal off a 4 series, fits perfect, and finally I sealed off the back area behind the rear seats with second skin, and put a layer of mlv on the floor of the whole car.. Car now rides at 60mph and has a 65-70 db swing in road noise, which is excellent compared to when I started.
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