10.8 is fine. I'd keep the GSR head and p&p, and with skunk internals you now have a head better than the ITR. Should see some nice numbers with that setup...good luck.
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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
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