Testing high on HC and CO, but low on NOx means that you're probably running too rich, and not all of the air/fuel is being ignited by your ignition. Here's a nifty little chart:
http://www.car-sound.com/04charts.asp
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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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