ACT HDSS clutch is the one for you.
You don't need to get a lightweight flywheel, but a lightened flywheel will give you better performance. Besides, you're already in there, might as well do it now. At the least, you'll need to resurface your stock flywheel.
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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