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E85 can be a pain in the ass if it's not readily available. Too much work IMHO unless you have it everywhere (we don't in CT). And it will help with detonation but not with engine temps. Put your money toward a custom tune with a good tuner and they should be able to tailor it to whatever you need on safety margin with 93, especially if you're not looking for outright power. You can even switch between tunes and can have a lower power 'safety tune' and a higher power 'street tune'. Then take the rest of the money and put it into heat management - you already have a good start with that oil cooler. Vented hood, upgraded radiator, etc. It also depends on experience and how hard you're going at the track - someone like CSG Mike will really push things harder than your typical track afficionado, and your track afficionado will push the car harder than folks who go to the track a couple times a year.
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