I am running a true GT3071R but with ext gate and i have made 260 rwkw on 13 psi and the engine sh1t it in, so much more if you wanted to lean on it and add more boost. All i am considering on doing is adding a 0.82 rear hsg so it will make more torque and rev to 8000 rpm. Only real thing i have different other than my ext gate and tune is a set of HKS cams.
The only reason i did not go with the genuine HKS GT2835 Pro S kit is the cost. But some times i wish i had gone with the full kit, very professional and super hi quality. I would regard it as the best low mt turbo set up on a std displacement RB25.