Look on ebay for butyl rubber sound deadening, I think I purchased 10 square feet of Onyx brand for 40 bucks. Cut strips and stick on the back side of interier panels to add mass. I did this to my X5 and pillar rattles are gone. The sound quality of the Top HIFI Sound system in mine improved significantely, it was very good to begin with.... The interior panels have a thud now instead of a ting... if that makes sense.
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