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Correct... Long term you would want the stock O2's maintaining the fuel trim. But for shear knowledge of actual AFR and what I've been using mine for which is verification that the commanded AFR from the ECM actually matches what the engine is actually seeing you need a wideband. I added a O2 bung into the passenger side downpipe so I could have both the factory O2's and a spot for my wideband.
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