At this time, there are no OEM performance models available via Subaru of America. Everything must be done via aftermarket tuning or JDM performance parts (little difference). Perhaps this will change in the future, and Subaru will see fit to bring some turbo Foresters to tour shores just like they did with the Impreza WRX. But it probably won't be for a while, so don't hold your breath. Until then there is always...
Although it is difficult to find aftermarket performance pieces for the Forester, they do exist. Most of the time, they just don't always say "Forester." Since the Forester was essentially derived from the Legacy and Impreza platforms, many of their performance parts are interchangeable.
Depending on what you want to do, maintain the dual purpose nature of the Forester or gravitate it Forester into more of a Sports Sedan or Sport Utility Vehicle, the aftermarket parts are available.
PICK A PATH FOR YOUR PERFORMANCE
Sports Sedan Dual Nature Off-Road