Turbo upgrade or replace


ok I can't decide what to do with the turbo, I have Garrett T25 lying in the garage and was thinking of replacing the IHI RHF3 turbo with it but not sure if it is a good idea and if it will make more power.

On the other hand I am considering to just replace the compressor wheel on the RHF3 with a bigger one, so that means I have to machine the housing of the turbo. I can't find the size of the oem compressor wheel of the IHI RHF3 anywhere on the net and so not sure how big I must go either. I was thinking maybe +3 millimetres on the inducer and exducer should be ok. What you guys think?

Oh...what size fuel injectors are on the YRV Turbo?