Quote:
Originally Posted by S65B40V8
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.
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Quote:
Originally Posted by m3an
I think this is the only real explanation, but again it is a little vague as it leads the topic stating "at idle" but I agree this is prob right and just us M owners being crazy over every little noise.
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It's not any type of resonance though (as decribed in 1.2).