If you're gonna get a flywheel, get a clutch while you're already in there. I have an ACT HDSS clutch with 7.5lb fidanza flywheel, and I love it. It's held up fine, and the difference between stock is night and day.
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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