exhaust is it, subrame and everything else would clear just fine, would need proper spacering and if there is a different exhaust that routes 2014 style you would be fine
The 2014 exhaust system may be your only hope -- if you can make that work you are all go. The easier way would probably be to just go with the 2015 st and a snow hawk track, that would get you close to SX performance.
The 2015 has more suspension travel although not quite as much as the SX.