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The "clunking" you get when shifting the DCT in neutral ( and almost certainly the MT when low speed declutching) is the result of torque reversal in the drivetrain. Basically there is a small amount of play in the propshaft, differential and driveshafts that is taken up when the engine is applying torque to the drivetrain...when you remove this torque (by declutching/shift into neutral) the drivetrain "unwinds" causing the clunking noise.
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