Personally I would avoid off the shelf boosters (too expensive) and ethanol (if it isn't readily available). If you really really want to raise the Octane use Toluene added to Gasoline. Used for decades, cheap, and available anywhere that sells paint. It's ~114 AKI and is less then 150 for 5 gallons.
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GTR TT 493Whp/431lbft, Ecutek, Southbend 6puck,Quaife, RPM RollBar 4Point, R888R, JRZ RSPro F(10R/10C) R(10R/6C) 1000f500r inlbs+150inlbs Tender, SPL everywhere. Full Specs
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