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Old 10-31-2008, 01:57 PM   #9
wrxhard
Scooby Specialist
 
Member#: 108091
Join Date: Feb 2006
Location: Fargo, ND
Vehicle:
2002 WRX

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Is the STI up pipe larger diameter than the factory wrx up pipe? That is the only logical difference i could see as all 2.5 cars have NO cat in the UP.
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