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      10-14-2017, 03:50 PM   #2
JsL
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Drives: 2011 AW M3 ZCP
Join Date: Dec 2013
Location: SF Bay Area

iTrader: (2)

Could be turbulence in the air filter and it's corresponding elbow pieces. Take the air filter out and leave the intake box open. Start your car briefly and give it a few revs to see if that eliminates it. Won't hurt to run your engine without an air filter for 10 seconds.
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