Basically every person that doesnt own a Z said the stock pump wouldn't supply enough for big power. They didn't care what i said or what a website said. Someone even found a fuel pump comparison site that showed that our pump wouldn't pump as much as a supra pump but all the supra guys change over to a dual pump setup just to make like 600whp.
I have the GT2871R and yes the base boost on just the actuator was 9psi. As far as how high the boost will go i have no idea never turned it up to find out. If i cant do it on the internal actuators i will go get some externals.