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