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      11-12-2012, 10:34 PM   #61
S65B40V8
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Drives: 2013 E92
Join Date: Aug 2012
Location: MN USA

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OK, how about this: any chance it's the intake resonance sound? This engine has a very distinct intake resonance in the 3-4k RPM range at say 70-100% throttle. I would describe it almost as a tearing cloth sound but could also be described as a knocking sound. BTW, I love that sound -- to bad it is only heard in a narrow RPM band.