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      05-08-2010, 10:42 AM   #7
rockd
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Drives: '11 Z4 35i M-Sport 6MT
Join Date: Apr 2009
Location: San Francisco

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^ I'm not sure about the claimed performance gains, but you're not going to get much from just mufflers. That's not the most restrictive part of the exhaust. But it does sound great!