Thread: High Frequency sound inside cabin after Berk Exhaust Install
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      01-26-2013, 01:58 AM   #2
wongie_jm
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Drives: 2015 M235i EBII
Join Date: Mar 2012
Location: Florida

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I had the same problem after the exhaust install. Found out I just had to plug the vacuum line for the flapper valve actuator.
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