Here is a Pte Scm6131 (620hp rated) for sale. Is is currectly pulled because of a piston wrist pin failure. Turbo had no shaft play. Installed brand new bearings anyways for good insurance. Turbo is in perfect condition and has a 360 thrust bearing system for high boost.
The S cover has a 4 inch inlet and a 2.5 outlet.
Oil it correctly and it will treat you well.
460$