If you plan on going over 350 hp, ACT xtreme, with a full faced disc. It will be stiff, but not as harsh as a pucked disc. It can handle all the power you throw at it. If not, just get the ACT heavy duty. That's what I have, not too stiff and grabs like a mother.
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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