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Discussion Starter #1
could the bung spacer for my race header be causing me to run rich? I will post a pic if that helps. When I rev the car at idle she spits out the back, everything seems fine though other that i get horrible gas milage. :sadwavy:
 

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I think you're referring the the defouler correct? If so that shouldn't effect the AFR in any way. Ithe secondary O2 sensor is merely to detect if you still have a cat - for emissions purposes.
 

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Discussion Starter #5
second, i have the flach, the Apexi filter and cut out maf housing but it is not shaved
 

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Discussion Starter #9
it is the rear, i was referring to my indifference in the matter since I cant figure it out.,
 

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Discussion Starter #11
did you have the bung? Maybe if i shorten the bung and more of it sticks out into the test pipe area it would lean out..... or is it just how the race headers function?
 

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Discussion Starter #15
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