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      01-18-2010, 02:38 PM   #7
DK35
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2010 X6 50i  [9.34]
I'm leaning towards the Hamann system. Was told that from a rep that 10-15 hp gain is pretty standard just from the muffler system. Found some pics on their website. The muffler itself is actually two smaller ones instead of one big unit and then they offer intermediate pipes and catalysts. Big $$ but can do one piece at a time. should decrease enough back pressure to get some more decent gains out of it.
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