If you run low pressure it will be fine...I'm assuming you're going turbo. If you are using a boost dependent FMU, get a high pressure pump. With larger injectors and a tunable EMS, the stock pump is more than adequate. It loses its efficiency as the pressure goes higher. If for some reason you are running an FMU like with a drag/revhard stock kit, I would ditch that altogether.
__________________
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