I recently saw a "stagger turbine shaft seal" upgrade to prevent Turbine-end oil leakage and smoking. In all my searches, it seems that this upgrade is only available for Garrett "T" series turbochargers, and not the Mitsubishi (MHI) turbos used in the Greddy TT Kit.

Has anyone heard of a source for this upgrade for the MHI turbos? It would seem to solve the smoking issues so often encountered by so many with the Greddy TT kits.