Question about turbo exhaust housing

I got a huge t4 turbocharger with a .60 compressor and a 0.96 exhaust housing. I wanted to reduce the exhaust housing before installing the turbo on the car.
What will happen if I install the turbo with the 0.96, 0.48 or a 0.63 exhaust housing?
Boost level, lag or whatever information you can provide me.
I have a sohc ka motor, will be matting the turbo to Jordan manifold.

thanx you for reading .

wrong section.