Are you sure you got the same computer back? Your description is very vague so try taking a picture of the ecu, and open it up and take a picture of your board. Are you throwing a check engine light?
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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
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