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2016 3.5EB p0420& p0430 codes for Banks 1 & 2 catalyst sytem efficiency below thold.

Running a set of Full Race catted downpipes. 8k miles since install. No issues with DTC codes/CEL til now and they return immediately after being cleared.

Thought maybe there was an issue elsewhere. How do you test for this?
 

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I got those codes almost immediately after I installed my Mbrp catted pipes. I ended up buying a set of defoulers on amazon for $15 and cleared the codes and they haven't been back in 5k miles. Not sure why yours took so long to show up but I'd recommend getting the defoulers.

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