Is it on standard injectors?
I have HKS GT-SS (aka -9s) on mine, I made 302.8rwkw @ 18.6psi - stock injectors, stock afm, boost is controlled by HKS actuators.
Now, I'm tempted to get injectors, nismo afm, nismo fuel pump and decent boost controller and go for broke and see what sort of power I can get out of -9s.