Our friends at JPC Racing are working on an in-house tune for the 2016 Shelby GT350 and shared some preliminary results with us.
Using HP Tuners, the dyno tune on the otherwise 100% stock GT350 Mustang put down 514 RWHP and 425 lb-ft of torque. If that number seems high, all you need to know is the tune resulted in total gains of 16 RWHP and 17 lb-ft with most of increased torque occurring in the mid-range.
See the dyno chart results in the forums.