That's the same code I had when my Passenger-side cat went bad. It may be throwing a code due to the high-flow cat. I'd try the non-fouler mod before you change the cat.
I had a p0430 cat bank 2 code come up a couple times while towing my trailer across country. I had my BBK shortys and mag Y installed before the trip and changed from the Edge to the SC tuner, and got this code 3 times in 2800 miles. Hasn't come back since I stopped towing.
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