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im planning on getting a mac off road H-pipe ....but my question is ....would this cause my check engine soon light to put up ?
 
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Yes it will. I believe you will need MIL eliminators or a tune to turn off the rear O2 sensors since there will be no CATs on it.
 

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yea the MIL eliminators will turn it off and i believe they plug into where the o2 sensor would
 
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