dont worry about the head being shaved, get some low comp pistons and as long as your compression is somewhere around 9:1 you will be fine for boost. Also you need to set a hp goal. If you want something with quick response, like a supercharger. Get a smaller turbo (like a t3) it will spool on your h22 quick as hell. I would suggest something bigger though because you will want to push more air and create more power than just a t3. I have a t3/t4 on a
d16 and the lag is not bad at all. It spools it at around 4k rpm (maybe has something to do with mine being a stage 3 wheel, I figured it wouldnt spool until a higher rpm but hey. Its better this way...) I believe when I put it on a 1.8 it will spool somewhere around 3k or 3.5k...

With honda motors, turbo is where its at...