Advice a modification turbo on Mirca K11 1.0

Hi, a little advice I have bought a custom exhaust manifold it design for fit on turbo IHI vf-25, TD04L and TD05H. Which is the best turbo for spool early rather than high revs. How much bhp gain I will expect?
Do I really need some extra parts on my list:
Intercooler?
Boost control for wastegate?
Change piston for reduced compression ratio because of fit turbo?
Oil cooler?
What type of injector? Saw on youtube fit powerful injector more spray inlet manifold
modified ga14de wide throttle fit to 1.0?
and where would I fit oil feed pipe from turbo to?

(I know one of you will said better go for the 1.3, but I like the 1.0 is cheap to running and low insurance)
any reply is appreciate

Fab
 
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