hello and welcome, :thumbup:
maybe its worth speaking to the doc ( atom x ) he deals with z20net engines a lot and i gather he removes the whole turbo setup.(inlet manifold exhaust etc)
its the sister engine to the z22se so all you would need in theory is:-
a whole new exhaust system (fairly cheap and easy if you carry the work out yourself)
intercooler set up (if the kit doesnt come with one)
injectors (blue or green gm's)
re-map or aftermarket ecu
manual waste gate valve (maybe)
from what i know 250 bhp should be possible with standard internals although you will be pushing it a little. other than that it will all go on with relatively little fuss as all the bolt holes etc, will be the same :thumbup:
if you speak to garret, (the z20net turbo manufacturerer) they can upgrade the turbo internals etc if more power is required.