Xp900 turbo sizing/feuling

So winter boredom and a broken foot that’s gonna keep me off the sled this season has me thinking bout building my own turbo setup. Air to air cooled, low psi setup (6# or so) tune it on the safe side and hope for the best…

Two questions maybe someone can help a guy out:

Injectors? Jus go bigger or add a 3rd?

What physical size / specs of turbo will get me in the ballpark?

T3/T4 internally gated deal in my position but needa pull it apart and get some measurements. Or theres hundreds of cheap td04 type turbos here local, of corse if there not too big

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