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The rocks sound have a lot to do with the tires. When I put on my winter rims (which are 245 wide 19") that sound is completely gone. One of the first things I noticed when I put my OEM summer setup on is how much rocks the tires kick up. You hear the sound all the time. I'm not sure if this car (F90) has rear wheel well carpeting but I'm assuming it does because it is even more focused on luxury than the G8X.
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