hmmmm so, my guess is.......
Headwork, inlet work, cams, increased throttle body diameter, map tweeks to suit.
Injectors - I hope so.
If youve done it without the injector changes you are running in the danger zone of leaning out if anything happens to an injector, normally you should run 80% of the injectors max, so on the standard ones thats 80% of (4x52) which is 166bhp, now the absolute max they are meant to push is 208, so either youve increased the fuel pressure to suit, or changed injectors..... hopefully the latter.