I opened up my side panels to put rear speakers in the Nismo this weekend, there is really nothing there to absorb the road noise coming off the tires. I'm thinking of adding something in there to absorb some of the noise. Looks to be an easy job. BTW, you can add the rear speakers without taking off all of the hatch panels. tight fit to work in, but doable, and you will cut your hands and wrist up if you don't use a long sleeve shirt.
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