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Is it only when driving over bumps or all the time?
I would guess subframe bushings, or sloppy pillowball mounts on the coilovers. My Stance have a bit of slop in the pillowball which causes a light "knocking" or "popping" when I drive over a bump. I temporarily cured it by greasing up the pillowbals real good but it came back shortly after. Almost makes me want to run rubber bushings back there instead of the PB's.
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