Lol, there's a thread about this somewhere, the problem with the 1w is its too big for the head and intake, you need some very large porting and a big vvalve head, there's a guy on here who offset his valve guides to get bigger than big valves to fit
You also need a much larger manifold, the gt one is too small at the throttle body, a g60 or larger throttle size is needed, as for boost, o appreciate it's all about flow, but even 22psi isn't going to be maximising the potential of a 1w, to push it you need to go turbo, and something bigger than a ko3, probably something similar size to yoofs turbo
This is from what I've learnt, read/ been told buy knowledgeable people
Taylor