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Old 05-01-2012, 04:42 AM   #554
northman
Scooby Newbie
 
Member#: 163631
Join Date: Nov 2007
Chapter/Region: NWIC
Location: Seattle
Vehicle:
07 Forester XT
Dom 1.5XT-R

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Quote:
Originally Posted by J-horn92 View Post
If you remove the air pump completely does it kill your mpg, or does it not have any effect at all?

No effect after the initial 90 seconds or so. I can't tell the difference. I suspect once you take out the factory downpipe that the secondary air has no actual function.
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