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      06-09-2009, 08:46 PM   #15
swamp2
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Drives: E92 M3
Join Date: Sep 2006
Location: San Diego, CA USA

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There has been extensive debate about the efficacy of this mod. Here is one person who got a lousy 2 hp. Link. Here is another really long thread and debate where RPI was shown to be giving inconsistent quotes on power gains. Link. Do some research before you buy. Investigate and draw your own conclusions.