Still got the cats... but
"Jackson Racing supercharger systems require Premium grade (91 Octane or greater) gasoline, as does a stock FR-S/86/BRZ. Fuel quality is very important with a high performance application, so remember to only use a “Top Tier” gasoline. Do NOT use Octane Boosters in your fuel system. Octane Boosters will damage your spark plugs and your oxygen sensors when mixed incorrectly."
quote from JR installation manual
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