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> Header on 7AFE cause performance issues?, Does putting a header on the 7AFE cause any performance issues?
post Apr 30, 2016 - 1:20 PM
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rapid36

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Hey guys I bought a cheap header off of ebay and its the aftermarket ones like this http://www.ebay.com/itm/STAINLESS-RACING-H...HAo&vxp=mtr , the reason why I ask is cause I redid the motor and bought a ton of new parts but now I have performance issue, I have really bad power till i hit 3.5-4k rpm which is really not ideal. and im thinking maybe its cause the header has the o2 sensor is only using air fuel ration from 2 cylinders instead of all 4 cylinders? does anyone have information on this? sorry guys im just trying to narrow down things is all, i'd like to get down to the bottom of my performance issue. im only getting 22mpg.

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