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I was following my M3 as we were coming back from Costa Mesa and the muffler on my m3 was shakeing up and down real bad. I thought it would fall off. I don't think it's the slabs but it is harmonic.
Try a bicycle inner tube between the cab and bed.
I used one to make a "Floating Sub box" for my 15" Alpine. No rattling in my M3 anymore just my brain.
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