check engine light

nickgt5.0

New Member
Jan 16, 2007
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Snohomish
ever since i put on my mac catback with 3.5 inch tips my check engine light comes on after about 10 min of driving and usually in any gear just riding in low rpm's? i have stock header, bbk o/r h pipe and mac catback with 3.5 inch tips. is it bad that the light is on or is it just normal with that much airflow?
 
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