Originally Posted by RobUK
Road noise wouldn't come through the door panels for the most part, and wind noise would be down to the aerodynamics of the mirrors and door pillars, etc. - more of a design issue I'd say. I'm guessing the bottom pic shows soundproofing felt on a Merc door? (NB, felt only deals with certain frequencies). Can't really see what soundproofing materials are present inside the BMW door
Tech said there is couple of holder for sounddamping material like F10 but nothing in there. He said BMW putting it later sometimes.