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Ryan5034 · 07-11-2017, 08:20 PM

My vote is it's something more simple. When you rev the engine the flapping changes. Wonder if maybe the serp belt broke or something. Keep us posted.

I have a 2011 50i I and love it. (even though it currently leaks oil.)

07-11-2017, 08:20 PM	#25
Ryan5034 First Lieutenant 83 Rep 360 Posts Drives: 2019 X5 50i Join Date: Jun 2016 Location: Fargo, ND iTrader: (1) Garage List 2019 BMW X5 xdrive50 [0.00] [0.00] 2011 BMW X5 xdrive 50 [0.00] 1964 Chevrolet Bel-Air [0.00]	My vote is it's something more simple. When you rev the engine the flapping changes. Wonder if maybe the serp belt broke or something. Keep us posted. I have a 2011 50i I and love it. (even though it currently leaks oil.)
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