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      03-21-2007, 02:59 PM   #13
SoCal335i
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Drives: 2007 E92-TT Jet Blk Coral Red
Join Date: Jan 2007
Location: Cali

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I think but dont hold me to it but the crossover pipe (x-pipe) may reduce the raspy sound in the exhaust. Since most companies are using straight thru resonated design mufflers the crossover pipe may help balance the air going thru and control the sound a bit.