If you change or delete anything you must use a professional tune or you will get codes.
ok, I am in the middle of upgrade on my 2015 Golf TDI CRUA 6speed manual: CP3, CR190, EGR/DPF delete, quafie differential, and south bend stage 3 clutch.
There are several vendors for tunes, do your research for which is best for you and your application.
I am using TuneZilla for my application. Review their web site, it has a lot of information. If you are unsure, find a local dealer and discussing what you are looking for/trying to perform.
Yes, for the 2015 TDIs they are a one year only and there is not a lot of information and some miss information, but that means you have to dig a little harder and look for clues.