It depends on how tightly you tune the fuel.

Generally 8 psi is a good number. That'll get you at least 240 to the weels with decent reliability.

DSMs run like 12 psi of boost stock. However psi is directly proportional to a lot of specific things about the motor, so comparing 12 psi on a GSX to 12 psi on a GSR is rather pointless.

I know this sounds overly simplistic, but:

What do you want the car to do?