If it was me, I wouldn't do it. I would save up for the GSR, or even go H22...Hell even just a plain ol b20 would be quicker than a b16. Remember, you only weigh about 250 lbs less than an SI coupe, so you won't be much faster than one.
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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