The disadvantage of modern DI engines is the soiling of the inlet valves by blow-by gases.
Here are some USA links offering rescue packages for the valves for the Mustang Eco engine, hopefully in the near future for the RS too.
The Mishimoto set is a plug n play solution, therefore I presume it will fit to the RS engine too, with minor alterations on DIY level.
http://www.mishimoto.com/ford-mustang-ecoboost-baffled-oil-catch-can-kit-15.html
http://www.boombaracing.com/mustang-ecoboost-stage-1-oil-catch-can-kit-ccv/
Rudolph