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With the Evolve tune, the rear O2 sensors will pass readiness which I assume means they are operational a greater range to prevent a CEL. Since minor adjustments to the mixture are made based on the rear sensors, this feature is enough to seal the deal for me. No other tune has this capability as far as I know. From what i can tell, all others shut off the rear sensors to prevent a CEL which causes you to fail inspection and lose the capability I described above.
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