If that's a question I don't understand?
Does MKV have SAI with a Kombi valve you can hold open while jumping SAI pump? Then block tail pipes and feel around flex joints?
If O2 zero out then I say same problem. Glad it's got you thinking about flex pipes. Kicked my A$$ for sure figuring it out.
The cats were separate from the down pipe with flex joints on MKIV so I got the whole dealer down pipe no cats.
If cats are part of pipe with flex joints I would think about welding new flex joints? Just get a real good type!!!! That's easier said then done...
Thank for the pointer - I guess not all flex pipes are created equal!
To close this one out: finally got around to replacing the injectors and problem solved. Many thanks again for everyone who helped.
Did you crimp off N80 and all intake hoses to isolate?
Have you done a leak down test of injectors plus look at plug's burn patterns?