rollup!

Was wondering what is peak boost for T-28? whats tha main difference in the T25 compared to the T28? I know the T28 is a ball bearing turbo but can it handle 15-20 psi? I also heard that basically the T25 cant go over 15 psi efficently well thanks for help in advance and if you've had hands on exprience with either these let me know and what engine you have it on thanks.