1)i have an ebay kit running 10 psi on my b16 crx and have no problems except traction!
2) if you take care of your turbo and dont beat on it constantly it will last and the mani that comes with your kit wont crack but i wouldnt get that exact mani because of where the wastegate is located what you want to get is a waste gate that is connected to all the exhaust runners and not just one!
example
bad:
good
3)if you get a missing like mapsensor bypass and a fmu you will be good for up to 8 psi so you wont have to get a tune but i still highly recomend it!
4)you have to drill a hole,tap and weld a fitting in!
go here for more info
http://www.beesandgoats.com/boostfaq/g2icturbo.html