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Old 06-06-2016, 08:30 AM
Jab555 Jab555 is offline
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Join Date: Apr 2016
Location: PNW
Posts: 18
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Just to add in if it hasn't been already. Had a supercharger like whistle for the longest time in my 3.0 x5 and it ended up being the air duct that is attached to the back of the alternator. Pushed it back into place and the noise was completely gone. This was a very noticeable whistle too.
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