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      01-10-2012, 11:58 PM   #10
Mike Benvo
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Drives: Harrop SC M3 / E46 M3 / 7Turbo
Join Date: Apr 2008
Location: SoCal

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2008 BMW M3  [5.00]
1990 BMW 735i Turbo  [5.00]
2004 BMW M3  [0.00]
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Totally normal from my experience. I had the same thing with my AFE intake mainly between 3,200 and 3,700 RPM - it's like a crazy resonance sound.

I'd have to hear it but initial gut feeling says its normal.
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