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Old 11-19-2001, 12:10 AM   #2
XT6Wagon
Scooby Specialist
 
Member#: 524
Join Date: Nov 1999
Location: WA
Vehicle:
04 STi
White

Default

It can throw off the reading, more due to the different flow before and after. A K&N cone + smooth pipe after will have the same air flow "quality" as a factory air boxl and rough pipe.

I would not worry about the diamiter much as long as you have the power band where you want it.
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