chipping the car lets u raise ya boost pressure,unless your anygood at soldering and desoldering i would advise you to let the experts fit your chip to the ecu.
fitting a -31 actuator allows you to run more boost as your standard actuator will not be up to the job..
...ideally u want to raise ya boost level to 14 psi,at this level of boost you should get about 170/180 bhp .and should be safe for fueling etc...
i would recommend you take your car to a decent tuner to get everything set up correctly ...