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.
Your turbo is new, we don't use regenerated components on SP51 projects.
Everything is new except for the turbine manifold & compressor housing.
Remember try not to exceed normal EGT levels, the turbine manifolds on these turbos become brittle if you run to lean. If you have a "cherry" under the hood after a hard drive consider additional fuel. A "red" turbine manifold looks cool but its a time bomb that will need our services in the future.