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What is the "underspeed pulley" mod?
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05-17-2012, 03:06 AM
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Flavor 987S
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Join Date: Jul 2009
Location: Arlington Heights, IL
Posts: 1,561
Is the Flat 6 part a Porsche part? Can any of you guys really "feel" at 5 HP gain? Is this a "while your in there mod" when doing the Serpt. Belt? Thanks.
Flavor 987S
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