With a Zex kit, you do not need any additional fuel upgrades. It is designed for use with a stock fuel system. I ran a 75 shot for a year on stock injectors, pump, fpr, fuel rail, etc. Just premium gas, colder plugs, and retarded timing. Now over a 75 shot, we are talking about fuel/ignition upgrades.
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2015 Ford Mustang GT Fastback - Ingot Silver - 6M - Performance Package - Gibson Catback, JLT CAI, FR 47lb injectors, BAMA E85 tune, Eibach Sportline, BMR wheel hop kit, UPR oil separator, Steeda shifter bushing/bracket
Team B.O.B.® - Ballaz on a Budget