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As most of the guys here are saying. 91 is highly recommended but not required.
I would baby the throttle, and not get on it as much on 87. It will retard timing, and you will gain less power per % on throttle input. Trust me, same feeling as if you get a batch of bad gas, you'll feel like you're making less power, and need more input for the same amount of power on good gas.
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