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      02-29-2008, 08:28 PM   #3
swamp2
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Drives: E92 M3
Join Date: Sep 2006
Location: San Diego, CA USA

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I have seen specs/results for interior noise at various cruising speeds. However it seems like you are interested in exterior noise from the exhaust. BMW tests this and has the information but I doubt they will release it. I haven't seen such info in mag tests either. So... good luck.
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