As a few of the others have mentioned, i've got a PSR440 (TD05H-20G with the 8cm2 Exhaust Housing) and currently at the wok's dyno it's pulling 295.2 PS with 400.6 NM Torque (altho the printed dyno sheet i got had slightly higher PS and slightly lower NM) so if you were to round it out it's around 217-219kW with 398-401nM Torque which could all depend on the outside temp etc etc, but that's close enough... so yeh basicly based on those figures i'd say you should see around the 230-240kW im only running 16psi boost... so still got a bit of head room heheh

Cheers,

SiriX

BTW, if you belive NASIOC there was a huge discussion on 06 WRX/STi injectors, some dude flow-tested the 06 WRX's blues (with charts to proove) and they were rated for 560cc (slightly more than the STi's 550cc) but yeh, so it's safe to say they're over 500cc injectors stock.