Skylarking
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I've had a cat in an older car (with only a single upstream O2 sensor) melt the honeycomb due to unburnt fuel entering the exhaust because of a failed spark plug. The honeycomb broke apart when it cooled after switching the engine offf. On next start, it sounded like a train on bumpy tracks when running and was down on power. So, i took the cat out and had a look. Loose melted honeycomb was stuck at the intake so used a chissle to clean up the cat entry area. Reinstalled the cat and as it turned out, not much had melted so the small amount of honecomb lost didn't impact anything noticably. Car ran OK for the next 10 years.
Admittedly, with both an upstream and downstream O2 sensor for the cat, a small loss of honeycomb may have a greater impact than in my situation. It may be worth a try if you have car ramps and axle stands and able to safely do basic spanner work.
Admittedly, with both an upstream and downstream O2 sensor for the cat, a small loss of honeycomb may have a greater impact than in my situation. It may be worth a try if you have car ramps and axle stands and able to safely do basic spanner work.