I just installed a Pypes mid muffler setup in my 2010, because i have not heard a 2005+ stang with the mufflers installed in the wrong place that sounded good to me.
I have no drone, some resonance on acceleration, but no drone at a steady cruise, at any rpm. even up an 8% grade in od (in other words, under load) steady throttle, no drone. i was very suprised.