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      11-20-2012, 10:20 PM   #79
nitehawk
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Drives: e92 335i 6MT
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Quote:
Originally Posted by E90Company View Post
Odd thing is my sound goes away after I get past the low RPM band. I would think if it's actually the compressor touching the housing it would stay constant, and at the same volume.
It might just be that other noises (ie, intake, engine, exhaust) drown it out in the higher rpm's so you don't hear it.