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      01-18-2013, 12:48 PM   #14
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Drives: 2008 E90 M3 SSII
Join Date: Oct 2008
Location: socal

Posts: 192
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Fabspeed claims about 16hp gains. I think it would be more like 10hp. The x pipe makes the sound a lot deeper and exotic sounding. it sounded awesome with my Active exhaust
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