Sounds like it's happening only on quick decel? Have you tried pulling the serpentine belt to eliminate all the spinning stuff?
Maybe a rattling heat shield ??
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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)
Last edited by 80stech; 07-20-2021 at 10:27 AM.
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