the factory injectors can support up 240rwk fine , you will need a higher capacity air flow meter, ie z32, but if you get a GTT factory turbo with those mods, you are looking at 210rwk max? i reckoen go for the Hks GTrs, its a straight bolt-on kit on your manifold, its about 2k for the kit if you will to spend the money, theres alot of info on the forum, just do a quick search