The error code being something else is highly unlikely.
It's a hard code that has 6-8 hrs of post drive time and is still active
Having had negative previous experiences with HP ( very steep learning curve/ non intuitive programmimng ) I chose Diablosport I3

Error code is P26C8

P26C8 error ...

Have the simulator plugs installed and after a month still have error code after 3 deletes

So the "muffler valve simulators" Will stop an error code.
Mikel reply;
"exactly"

Thank you. Much appreciated.
Hary Gahtoe

Something like this ?

So it means; I still have to connect the factory valve units to prevent error codes even though there are no actuater valves in the pipes ?
I can do that, although it does seem counter productive.

Next question then;
If this is my only option where do I look for a plug-in simulator?

I'm open ...

I'm in the middle installing a full Stainless Works exhaust on 19 Camaro SS that comes without the mid AFM valves.
I have used the Diablosport I3 Platinum to program disable of AFM.

My question is;
Can I physically remove the GM exhaust AFM valve unit and plug the end of the electrical connector ...