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Zero af3 tables then disable cel code for o2 voltage. I've been running with zeroed af3 tables for a year with no noticeable issues. Another thing if you intend to buy a new o2 sensor. Going catless might be why the o2 deteriorated prematurely. I bought a new o2 but left my bad o2 in for my catless header.
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'13 Firestorm
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