Nonsense, and I think this ongoing discussion should be put to rest. There's no codes associated with this mod, period. People need to stop the paranoia about this.
Why? Easy, first because one does not get any of these codes and/or messages each and every single time the OEM exhaust is replaced for an aftermarket, even a BMW Performance catback, etc.
Second, when my injectors rack were replaced I got a copy of the codes printout from when it went in for service, looked each of them up and none of them meant anything other than the injectors issue. The real and ultimate proof that, at least on VB73 335s, the unplugging does NOTHING!!!!
Now watch as despite this the debate goes on and on and on.....