A plugged cat will also superheat because of the obstruction, causing eventual failure of the cat.
If your cat is glowing, that would be a sign of a problem...
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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car
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