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My M6 2SS does this as well and I've isolated the noise to the rear of the vehicle. Does your trunk latch ever not catch when closing your trunk? I'm thinking its either the hardware that mounts the OEM spoiler or the heat shield at the rear of the car. Its just pot metal that is bolted directly to the tub with nothing by way of damping between it. The rattle is even more noticable since I installed racing headers/exhaust... I'm thinking about ripping out the crap heat shield and installing thermotec heat shield. Thermotec would dampen the exhaust note reverb'ing thru the interior and would dissapate heat better than the OEM heat shield!
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