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I have 2005 N62 4.4 and the alternator is definitely not whistling - I'll post a video tonight. It's an after market alternator installed way back in 2011. The only whistling issue I have is when my dynavin Bluetooth is on. The whistling is from the speakers.
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'05 E53 X5 4.4i, '97 E39 528, '07 E92 335i, '16 F86 X6M.
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