2015 650S little rattle (Gurgling or Grinding) noise upon acceleration. around 1500 RPM

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Bangski

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Recently Purchased Low Mileage 650S. Car has 8556 miles on it. When I picked up I didn't noticed but there are noise upon acceleration.
It's at the shop but couldn't figure it out 100%. Noise is like rattling or gurgling or Grinding. At Idle there are no noise. but as soon as I push the gas there is noise from back.
Almost sound like exhaust rattle but it not it. Possibility of Driveline Damper? I don't think its timing chain or guide issue because at idle it's quite.

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