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      05-22-2008, 12:16 PM   #4
M3BALLER08
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Drives: M3
Join Date: May 2008
Location: Teh Hills

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I went with the Eisenmann system for my M3. It sounds great. I haven't done any dyno runs so I'm not sure if it makes power but it feels ok on the butt dyno to me. I doubt a muffler would add much hp either way.