I have GT-SS (aka -9).
They're fantastic turbos to have. I have 302.8rwkw @ 18.6psi (will need to put up the dyno sheet) with these turbos along with Cam Gears, HKS front pipe, gutted cat (good for flames as I found out @ club cruises) HKS 3.5" cat-back exhaust and pair of HKS pod filters (I know, haven't bothered trying to source a stock airbox).
Injector duty went 91% cycle while tuning, and other night went home from work I hit 92% so I'm in search for bigger injectors, Nismo AFM and decent EBC (I still have stock injector and AFM atm).
Usmair, what are you doing with compliance cat and I'm assuming a stock front pipe? Change them ASAP!!!