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Back on topic, the one real data point we have here (from our OP), indicates that my research on cool-down time misled me somehow - I think it'd be nice to figure out why, or if the OP's case is isolated.
Also note, grill blocking may make a noticeable, but not gigantic difference in cat cool-down. From the cat's point-of-view, the rest of the engine is pretty cold.
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