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Old 11-18-2001, 11:10 PM   #2
Scooby Specialist
Member#: 524
Join Date: Nov 1999
Location: WA
04 STi


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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