whoa there, buddy!

You can post all your questions in one post.

People regularly boost around 6-8psi on a stock motor, but well tuned, 10psi isn't out of the question.

I'm not really the guy to tell you what turbo would be best... try PM'ing Jkan2001 or civicsleeperEX (I don't remember their actual usernames, so you'll have to search), or just use the search function (on the task bar near the top of the page).... there have been many discussions of this in the civic forum.

IMO, vtec controller is pretty useless.

And the exhaust housing attatches to the exhaust via a downpipe... just a piece of piping that goes from the turbo down under the motor and connects to the cat/exhaust...