uprev tuned, he should not have an issue with AFRs at that point. Where they are is where they stay as long as some freak burst of air floods his motor. NA VS FI is much more predictable which is why they run FI around 12:1 AFR's or lower cause there CAN be large variations in air. If 91 octane is what you had in the car when your guy tuned it you should be fine. He SHOUDLVE been able to tell if there was detonation or not when tuning it on the 91. If not, thats scary........
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