Can you give us a little bit more info. on what the sound sounds like and when it happens?
Do you hear it ONLY when you downshift (do you revmatch or double clutch?), or do you also hear it upon deceleration (i.e. off-throttle)? Is it a loud metallic clunk, or more of a plastic/other sound? ... does it seem to come from the interior or does it "resonate" from the frame/chassis?
My first thoughts would be either a lousy J30 VLSD install since he mentioned it... although it could be any number of things from worn subframe bushings to a loose exhaust to dying suspension pieces.
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