Originally Posted by Shmoo
Those plugs will foul on a stock motor. There is no reason you should be putting those in your car. Use the stock ones unless you have a good reason for the colder plug.
They will not foul, they run perfectly fine.
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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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