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P&G may be able to clog the cat this way but I don't have any data to support it. The newer cars, I don't think so. Some countries have emissions laws covering coldstart emissions and carmakers have had a lot of work to comply. Ever notice how a number of brands have redesigned so the exhaust is on the back? That's to allow quicker cat light with a cat that's closer to the engine but not too close like the cat-attached manifolds.
I know there is a lot of info here supporting P&G but I did a little research on the pollution it creates and it was significant. I tried to get a gov't grant to evaluate it properly but they felt that although the added pollution was significant the incidence was low enough that money was better spent on other research and enforcement.
-Michael
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