Spoke to a company tha refurb and upgrade turbos this morning and they reckon that they can refurb the K04 Cupra turbo and include a new thrust bearing for better reliability and shorten the shaft for better top end power through ability to run slightly higher boost, although this would be at the expense of the spool point being a bit higher up the revs.
Only snag is you would need a custom map to take advantage of it. I am going to try and find out a bit more about the person who has had this done already (who according to the company I spoke to is very happy with the result).
