Your computer is tuned? What kind of engine management are you running? If you just have an FPR and 450's your computer isn't "tuned." You need to offer up information like this before we can give you answers.
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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