Well i thought to make it even more FAQ worthy, I'll just add some more stuff i found out <img src="#/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt='
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Ok, the ultimate turbo for a KA running 4-10psi would be t3 with a 60 trim. The .42/.48 ratio is good for lower psi and .60/.63 would really benefit for higher boost settings.
Now about fuel. The stock KA injectors will max out at 4psi at 6000rpm. In order to go above, you can do several things. The easiest (and expensive) is getting the injectors and getting a afc or reprogrammed ecu. Harder but what still might work is getting an afpr and setting the fuel pressure higher (you'll be pumping more gas each duration on stock injectors). The tough part that comes in is that when not under boost you'll be running rich, and at some point will have a very crappy idle. It's probably possible to got 2-3 more psi (6-7psi overall).
Hmm... that's it for now. I'll add if i remember something else.