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Based on the amount of increased airflow the unit generates, it's imperative that one of the two supplied tunes for the CAI is uploaded into the PCM. Failing to reflash the box could result in major engine damage due to an air/fuel ratio that is much too lean. JLT's instructions actually call for reprogramming the 'Stang's PCM much sooner, during the CAI installation process, but we like saving this procedure until after all of the cold-air hardware is in place. Of course, we had the good fortune of Jay Tucker himself dialing up a custom tune for Shawn's ride.