430 P1134 and P1121

Trying to gain some insight into these codes I have in the background. I have zero lights on the dash, these were pulled from the left and right ECU's as a "let's see if there's anything in there." I cleared them as I figured maybe swapping out the lower Intake Manifolds somehow populated them (I replaced with scuderia lower manifolds, I wanted the polished stacks!) But that was over a month ago, so they have "repopulated" since. Again, no check engine light.

I have plenty of mods including the 360Trev tune, and the car runs like an absolute champ, so it doesn't seem like they're actually affecting anything? Can someone offer some info on what these codes are to begin with?

About the ONLY thing that I noticed that was not there at 8 am but was present at 4 pm one day taking it to work is the exhaust for some reason doesn't sound as it did. This issue just started happening within the last couple drives - NOT immediately after replacing the intake manifolds so there very much should be nothing wrong there. I would always love shifting at 4-4500 RPM as there's a raw growl at that point, for some reason it doesn't seem like that's there any longer. It also sounds a bit more quiet as well. The loudness I would get at 4500 isn't present until over 6500 now. I thought maybe the exhaust controller was flaking out, but it is fully operational with no exhaust leaks or issues. I realize it's extremely difficult to not only describe noises but also help in diagnosis of noises without the car in front of ya, but figured I'd give it a shot anyway.

I have already done a master switch reset and even replaced my battery just yesterday as I didn't know how old it was, no change.

Any correlation to the codes and lack of exhaust noise? Or are they two separate issues? Thanks guys

- Shane