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      11-17-2012, 11:16 AM   #9
RequestTheOverhead
Going Mach Chicken
 
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Drives: e90 pre-LCI 335
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Location: Denver, CO

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Hmm.... that's weird. It could be some electrical interference from a poorly shielded wire, or a high current wire, that closes to your front-center speaker wires. That's the only thing can think of that would cause the sound to start when the headlights are switched on or the revs are increased.
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