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Interesting. Is your "measuring device" a stand alone decibel meter or an app on your phone? In either case, what brand/model/App? Thanks--Bob
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2019 540xi M Sport, Carbon Black/Cognac, 2014 328xi, 2016 Corvette Z06; Previous:2010 BMW 535xi M Sp, 2008 335xi, 1998 M3 Sedan,1980 528i, 1977 320i, 1976 2002
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