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Have you tried knocking with your hand on the interior side of the deck? I would then do the same but from inside the trunk.
See if that replicates the noise. If not, I'd have someone ride in the back and pinpoint it.
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2024 M3 CompX Dravit Grey - MP HAS - Millway - MHC+ carbon - CS software - MAD single-mid - PPF
2019 G05 X5 x40i, built 2001 600whp B5 S4.
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