turbo kit + larger injectors,fuel pump and some sort of mappable ecu. something like greddy e-manage blue will work fine. if you are going to run more than 275-280bhp..then forged internals are recommended. if you can swing it..you will love the upgrade.
for a couple of bucks more (or probably the same price) you can find a used e-manage blue and some larger injectors. tried and tested as Jay already mentioned.
yeah i basically got it for nothing in a kit i bought off a mate. i might guinea pig it and give u guys some feedback if it hasnt already been done, worst thing would b it doesn work well and i do what youve said above