The K04 fitted to the Z20 engines is reknowned for failure when the boost is wound up, and even in standard guise in a lot of cases.
We chose to disassemble both a failed unit and a new unit, and discovered just how poor the standard thrust bearing oiling system is. This seems to be the general cause of failure, and so we went on the hunt for a reliable unit fitted with a full 360° thrust bearing that had oil forced into the correct area.
These units are what we arrived at. They are standard sized, with the later style more efficient compressor wheel fitted, but have proper bearings fitted for much better reliability at higher boost levels.
They come as a bare core section, ready to be fitted into your existing K04 compressor and turbine housings. Ideal upgrade for when your standard turbo fails!