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I usually just knock out the honeycomb and drive on with the CEL. One time I bought a no-name cat for $120 and it didn't resolve the P0420 CEL.
I'd be more inclined to spoof the downstream O2 sensor via thread extension or some other method than wasting time and money trying to legitimately pass stupid inspections. That said, I wouldn't run a car that is smoking or otherwise running poorly.
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