this is the information that i got from the seller

SUPER TURBO

( 1 ) T25/T28 TURBO


Turbo is in Great shape - No problems at all with
any of the parts.

.80 A/R EXHAUST

.63 COMPRESSOR

.67T COMPRESSOR WHEEL CAPABLE OF .59 Lb/MIN AIRFLOW

BOOST AT 3000 - 3500

OIL AND WATER COOLED

CERAMIC BALL BEARING TURBO

INTERNAL WASTEGATE @ 18- 22 Psi Actuator