it wouldn't work. the sync system hooks into the new unit.
AmericanMuscle has hinted at a possible release from raxiom of the same nav being available for non sync people. no timetable but it sounds like it's in the works for later this year maybe
2014 Ruby Red GT A6 : '13+ GT500 rear valance, Magnaflow Catback Quad Tip
more to come...