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      12-12-2012, 02:53 PM   #18
Wrngway's Avatar
Drives: '11 328i Sedan A6
Join Date: Jul 2011
Location: D.C. Metro

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The AA Exhaust should have less drone now that folks are figuring out what's causing it with that system. It sounds like a slight modification to the hangers will elminate most of the drone around 2k rpm. The resonance chamber also works to reduce it.
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