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08/09 STi quad pipe exhaust on a 09 WRX?
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08-18-2008, 08:09 PM
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be1ieve1111
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Join Date: Feb 2008
Location: Portage, IN
Posts: 399
Mine's on the left, and it's perfect, more pipes don't make more HP.
what if... 1 pipe=100hp?.....
Now, What about for every inch of the diameter= 100 hp?
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