Just bought my first Sub, a 2010 WRX 4-door, went right to the Sage II mods after a quick breakin. After doing some data logging with my accessport; the fact that the injector duty cycle hits 90% early in a full throttle run (which I've read is max??), and boost is reduced and wastegate duty cycle increases; it seems like there might be a little room for a fuel system upgrade before spending the money for the stage III. Can anyone tell the stock injector size and what fuel pressure is regulated at? Are there any good tech manuels out there without sending all the cash on the factory ones? I've got a ton more question, but better stop here for now.