You can use the Type R cams just fine on OEM springs and retainers, as long as you keep the stock redline...don't go past 8200. If you actually have aftermarket springs and retainers, you can go higher than 8200.
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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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