G'day mate,
Yeah the stock turbo will handle that fine. I'm running about 12psi controlled by a greddy boost controller, a full exhaust, fmic and a power fc.
As far as the max power of the stock turbo goes, i'm sure if you have a bit of a search you'll find some good info. I doubt it will produce much more than 200rwkw though as they really start to run out of puff at or beyond 14psi and also lose reliability....
Mine is also my daily driver now until I get another bike. Just out of curiosity what kind of fuel economy do u get with your current setup?
Cheers mate.