If you can only make one upgrade to improve power in your 2011 to 2014 Mustang, custom PCM tuning is the way to go. While a basic handheld computer programmer is nice, a dashboard monitor system offers so much more, like information about your Pony's critical engine functions and even real-time info about your fuel economy. While all of these tuners come with pre-programmed "canned" tunes, you can get much better performance with a powerful custom PCM tune from Stage 3 Motorsports, which are capable of compensating for a wide range of extremely powerful performance parts like long tube headers, nitrous kits, and even superchargers. Once your tuning situation is figured out, make sure to take a look at our 8.8 Mustang Rear End Gears or 2011-2014 Mustang Aftermarket Suspension Kits.