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I was talking about a system for a turbo car. I wouldn't run a 3" system on any N/A car that was for the street.
This type of exhaust system is fine for a car that is used for street work. Stop start traffic. Being stuck in traffic has no effect on how an exhaust system works, when you consider that the engine is not far off idle, just for long periods of time. Sure engine temps may rise, but that is due to lack of airflow through the radiator. Not the size of the exhaust.
The info you have supplied about the working of a cat is, as far as I know pretty accurate. I was happy not to include as much info, for the sake of simplifying.
Cheers Cromax.
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