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      09-21-2007, 02:19 AM   #14
retrodrive
Lieutenant Colonel
United_States
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Drives: 335i
Join Date: Jan 2007
Location: Irvine, CA

iTrader: (8)

From what I understand, downpipes add some boost to stock 335. Thus, the extra power. A car with a piggyback does not get much advantage except faster spoolup times.