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To be clear I wasn't just driving the car around, I followed the Ford drive cycle to the T.

I have a 2008 Mustang Shelby GT/SC with 14K miles on it. My concerns started when I couldn't get the care to completed a drive cycle. Evap, O2 and Cats not ready after driving over 300 miles. I've replaced the BBK highflow cats with Magnaflow cats and drove approx 60 miles still with no luck...