Hi Sepp,
That's exactly the problem. It's impossible to determine which pipe fits definitively, neither in the AKTE system nor in any other spare parts catalogs. I visited 3 VW dealerships, including a VW-Audi center. They spent hours trying to find something, but they couldn't.
There's also no

ARL lying around that one could check.
"Back then, I bought a cheap GT1749V on eBay as a test, which is now failing. I suspect a bearing failure. Whether it was ********'s fault? I have no idea. In any case, it worked wonderfully with the GT1749V, so I've now obtained a new or replacement turbocharger."
Unfortunately, due to my studies, I have very little time left for both the website and my car.
But the response has really surprised me so far. So many emails, and now even here.
I think there isn't a topic on the page that I've been able to finish yet. Everything has been started, touched upon, but nothing has been really explained in depth. When I have time again, we can build something again.
But thank you very much for your effort regarding the pipe!
Greetings.
Thomas.