I am not sure about the lower line oil return on that turbo, you may or may not need an install kit. Thing is though, you DO NOT need that turbo yet. You must (not need or nice to have, must) have bigger injectors and a fuel control of some sort. A fuel pump is a must. There is no way you can run it without a FMIC either. Its just too much turbo. For what you are wanting to do and what you have to spend, its not going to happen bro. That 20G is going to cost you around 3G's to install with all the supporting mods required. They are a requirment too. That thing flows some major air and you would need some major tuning to run 18 psi on pump gas with a FMIC and all supporting mods. The Big 28 sounds more like what you need. Don't think I am being a dick dude, its hard to tell people some things in type written word on the net without coming off that way but thats not the message I am trying to convey. All I am saying is if you have to ask about injectors for a 20G, you are not ready for it yet. Do a LOT more research and in the meantime, upgrade your turbo to something livable for your current setup. A small 16 can be used with a SMIC as long as you are not boosting to the moon but anything more is just too much.

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1999 Civic SI, Boosted and built, 12.67@112.

Gone but not forgotten.....
1998 Eagle Talon ESI, built and boosted 14.2@98
1992 Eagle Talon TSI AWD12.91@104
1992 Honda Hatch swapped and sprayed14.0@108