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Message: <blockquote data-quote="bass_lover1" data-source="post: 6346394" data-attributes="member: 555256">The pressure that is created when you shut a door/hatch needs to go somewhere, that flap is what equalizes the pressure inside the cabin to the outside air pressure.  You can cover it, but like I said it's going to be a bit harder to shut your doors if you do.Dynamat will help.  To step flex you need to add mass, which is exactly what stuff like Dynamat does.  However, there are a multitude of choices as far as mass loading products goes, Dynamat is a good one, but it is expensive when compared to similar products.Sounddeadenershowdown.com is a good place to start, you don't necessarily have to buy from him, but at least read up on the products he sells and what they do.</blockquote>

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