I am running an X-Force tbe on my MY11 hatch. Never any issues with it, no drone and very nice sound (still sounds much different to the older wrx's with cannons though) one strange thing with the exhaust on the hatch is that the 2nd exhaust outlet from the right of the car generally stays quite clean when the others go black, simply due to the fact that the exhaust gasses are forced to the end outlet and not as much gets through to that one. I believe the sedan system is designed differently to the hatch though.