http://www.cobbtuning.com/info/?id=4362 Pretty big development and something tuners have been wanting for a while now! Cobb just made tuning big turbos a little easier with the stock ecu. Too bad it is only drive by wire cars.
Its not out yet for release. Only a select few have the beta 08sti stuff. Fisrt thing out will be for 08sti. Then they will do 07sti working on back to 04sti. From there they may do wrx and then finally the lgt and fxt. So I wouldn't hold your breath.
This will also be a protuner feature only for awhile, so don't expect to see this avail to download and tune with street tuner software.