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heres our answer from ncsi For the header just use 2 spark plug non foulers you need to drill one out with i think a 1/2 inch i'll double check.......and that screws in were the downstream(were the o2 sensor that is normally behind the cat the 2nd one) goes then screw the other non fouler into that and the 02 sensor in to them....I never had a check engine light....do a search u'll find a diy.............
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