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A lot of noise gets into the car thru tiny openings such as around doors and windows, or is generated by mirrors, wipers, and antennae. One way to find these leaks is to get a 3 or 4 foot rubber tube to use as a listening device and listen all around the passenger cabin while someone else drives. There are also sheets of sound absorber that one sticks on the inside of the door between the window and the outside skin. I'd try the rubber hose thing first to see how much noise is leaking in and where, as it works and the price is right.
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