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      10-29-2012, 05:40 AM   #8
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Drives: 06 330i
Join Date: Jan 2010
Location: ATL

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Your N51 should have a 3 stage intake manifold. Have your DISA in your manifold checked to see if the flaps or any associated parts are loose causing the sound. When you said the sound comes during heavy accel between 2 - 3,000 rpm makes me suspect it.
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