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I have been running it on my 2017 ZL1 build all this year as a safety net (never know when you might get a bad tank of gas). We were running ~ 95 octane on the dyno early this year and picked up a bunch of whp (double digit). Right now I run around 97-98 just as a cheap safety net for knock/detonation.
Won't hurt to run it on a stock car not sure of any realized gains on 93, likely minimal. Going from 91 to 93+ in your case would likely show #s on the dyno but nothing you'd feel with a butt dyno.
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2017 Camaro ZL1 Coupe M6 (847whp Dynojet on 93)
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