You can always go with e85, but the gains won't be nearly as high as a FI engine with it, but it is an option. If my memory serves me correctly, I think people have gotten around a 25-30 hp gain with this on a N/A 370Z.
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~Rob 
-DD Air Guide, Stillen G3 CAIs, 63mm Throttle Bodies, Motordyne M370, Berk HFCs, FI TDX CBE (non-res, CF), Sprint booster v3, Ecutek Dyno Tuned, and the list goes on...
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