well the cat i bought was 120 shipped i just hope for it to work to pass smog 2 more times. maybe swap out the OEM and clean it out for fun see if that works too / shrug wish i had more free time.monitoring sensor data is useless unless you are 100% sure the sensors are reporting accurate data.
I would be very hesitant to also replace something without knowing exactly what caused it to fail.
You could end up ruing a brand new $300 (not cheap) catalytic converter because of another underlying issue.
and if your catalytic converter is cheaper than BOTH upstream and downstream sensor then it's probably not good quality and will most likely end up failing and throwing more emission codes.
the sensors are 80 and 50, tempted to resell them depending if i need them or not. never tried seafoam before but i know i own a few cans of it at least in my garage somewhere. guess i could give that a go after the s-vcm comes in on the 29th.