SCT Performance’s new X4 Power Flash is a sleeker, more modern handheld tuner that delivers the performance tuning you expect, and a few new features that are sure to become essential aspects of ...

We installed this cold-air kit from BBK Performance, along with a 90mm BBK throttle body (not shown), on a 2011 Mustang GT. The SCT X4 Power Flash Tuner comes preloaded with calibrated BBK tunes.