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front sensor tells computer how much fuel to add. rear sensor tells computer if catalytics are working. you have to run front sensor to the bung on your headers (extend wires if necessary) and let rear sensors hang in the air or remove. most likely will have to live with a cel due to no cats. note that sensors are interchangeable, so if rear sensor wires are long enough, you can swap them so as to not have to extend wires.
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