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Problem with pre-heating the cat - Engines run slightly richer during warm up as a means to heat the cat quickly. A cold cat can handle the excess fuel without gross pollution.
Pre-warmed cat + cold engine == engine still running rich and cat over heating.
At least I think. I have no proof to back this up, other than what I know about excess fuel entering the catalyst, and causing it to heat up substantially.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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