Thread: Turbo help !?
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      01-23-2013, 04:33 PM   #3
Drives: '11 E92 M-Sport
Join Date: Jun 2009
Location: Chicago, IL

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Chirping at fluttering sounds are completely normal with the BMS intake. It definitely makes more of them as you are light on the throttle right before the next shift. It's just the bypass valve opening and closing based on intake pipe pressure
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