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      05-31-2011, 09:10 AM   #5
Mike Lu
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Drives: E92 AW M3
Join Date: Feb 2011
Location: E. Lansing

Posts: 633
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2010 BMW M3  [0.00]
2009 BMW/M3  [5.00]
Challenge + Eisenmann will provide one of the most high pitch exhaust note out there in the market, especially at their price range. Challenge Street X-pipe by itself is more about increasing the air flow, reducing end pressure and the drone. Another great thing about the street version is that no ECU flash needed!
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