I've used a plain bearing T25G from a CA18DET S13 on an A12 with drawthru 1.75" SU and it worked great. enough boost at 60kph in 4th to keep it going up the steepest hills. Only ran its standard internal gated 8psi and it went hard. Never had it on the dyno, nut it would easily have been a match for my 116rwbhp L18 1200.

If you're running drawthru you need to get the turbo rebuilt with the right seals. Not sure if you can do that with BB cores.

you'd be mad to fit a used ceramic turbo to any motor! people rip them off GTRs and stuff before they let go and the ceramic dust kills their motor.

The only factory BB turbo I can think of is the T28 from *some* JDM S15s.