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Just an update on this issue... I have taken the vehicle to 2 shops. One a BMW Dealer in Columbia, SC and an independent BMW shop in Augusta, GA. The BMW shop doesn't see anything wrong and the independent shop believes it is a connection issue between the midpipe and downpipe. They tightened the exhaust connections and the sound went away but came back this morning. Does anyone else have any recommendations or any other shops I can take it to? Thank you in advance.
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