There actually is an inconsistent random "problem" that we've discovered both the 2013 v6 or 5.0 auto Mustangs. Just as someone already mentioned, it limits your rpms to 2k or less. However, we have found a fix for this in the factory PCM and include the fix on all of our Bama tunes for 2013 autos. So, if you're interested in rippin' huge smokey burnouts and picking up a solid & safe power gains through the power band, I'd be happy to help you guys out with a custom Bama SF3 tuner
Let me know if you have any questions!