Great.

You'll find that if your intercooler can keep the boost temps under control, that more boost will lower your EGT's.

I have also found that turbo backpressure is roughly double boost, but on a turbo that is too small, your exhaust pressure will skyrocket.
I tried to run a T2 turbine on my 4BD1T in place of the T25, around 3500 rpm the back pressure went to 45psi to provide boost of 15psi.
The T25 would run 30psi to give the same boost almost irrespective of revs.