Originally Posted by Opie
Blame the EPA for the hesitation...it's caused by a combination of air-to-fuel ratio's and the boost level of the OEM turbo...
That's a poor excuse. Whatever mixture is required the ECU should be able to run it in a steady-state, and it can't. Not to mention it doesn't stutter when you just go WOT all the way through the rpm range. If doesn't do it at WOT, there is no reason it can't be made to not do it at partial throttle.
Whoever did the ECU programming at subaru needs to be fired, and never allowed to touch a computer again. (I'll stop short of a firing squad for gross incompetence)