Need some performance input

Aftermarket ECU is the best possible mod you can do.  Even on stock parts, performance can be found.  

Cams are the next step, along with cam gears if you want the new cams to work their best.

After that, injectors and more boost combined with a good front mount intercooler.

Thanks alot Anthony. About the ecu what should I get a daughterboard. Have u heard of Nisstune they have boards for the gtirs

i thinks he said everything in the wrong order.

fuel pump ,
intake
exhaust
than 1 bar loop .
aftermarket intercooler
aftermarket ECU
bigger injector .
cam .
and its goes on .

id go turbo before cams

Thanks alot so has anyone heard of Nisstune?

I've got NIStune , if you're interested you could probably order from a US supplier rather than directly from OZ to save yourself some freight. 

My non-professional opinion regarding performance is that the amount of additional power (and reliability) you're looking for will determine the type of modifications. For massive performance gains, you might want to consider forged internals. 'Smaller' performance gains you can tinker with ecu, fuel supply etc.

I'd def start with the fuel pump. 

Considering your mods already

Maintenance items,
Fuel pump
WIDE BAND 02 sensor and gauge
Boost controller

BRAKES BRAKES BRAKES!

Thanks alot guys and greenman ill keep you in mind when for the NIStune first off is the walbro 255 fuel pump i was looking at other forum topics and i think ill get the sentra one.