Comes with a new ugly, riced out looking rear wing, six piston calipers squeezing 14" 2-piece rotors on the front, a better track suspension including Adjustable shock/struts, new F/R springs, strut tower brace, new stabalizer bars F/R, F/R jounce bumpers,(not sure what that is) and adjustable C/C plates.
Sounds like it will be a pretty fun car on road racing track or autocross event. From my understanding the Stage 3 was already a pretty composed car in the turns to begin with.
The car will also comes with a MSRP of $58,245 and their will only be 100 produced.
ROUSH Performance - ROUSH Mustang 427R Trak Pak