Your turbo swallowed something, similar to Mark's situation. I will send pictures of the damage soon.
At this point you will need a new K04 shaft unfortunately we have a slight waiting period since recently selling out.
There are 8 new K04-023 shafts arriving in 2 weeks and we will hold 1 shaft for this project at your request.
The upgrade I have in mind has our largest wheel options for the K04-015 and includes the SP51X compressor.
The "X" wheel will be tied to a K04-023 turbine shaft, this shaft is found specifically on Audi Motorsport cars.
This upgrade requires re-profiling of the turbine housing to accept the larger K04-023 turbine shaft.
The K04-023 has approximately 3mm larger inducer compared to the K04-015 sharing the same exducer.
In addition this upgrade includes the over-sized SP51X compressor wheel, updated Bearing Housing with "twin-feed"
oil canals and every CHRA that leaves this workshop is tested to the extreme.
We can accomplish this task for $650+ship, I would consider a lower price but the donor doesn’t help us because of the damage.
Let me know how to proceed?