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      06-03-2010, 04:07 PM   #10
Fen335i
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Drives: e92 M3 / X5d / Z4 M Roadster
Join Date: Jun 2008
Location: Pacific Northwest

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From what I understood, the upgraded xpipe and HFC's is where the biggest bolt on gains are....interesting (however depressing) that the gains weren't felt much. Makes me re-think this mod...
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