Originally Posted by ebrabaek
You might be on to something. If your CAT is plugged somewhat it will burn more gas, and get hotter down stream.
I've gotta disagree. If the exhaust was plugged, it would run richer, yes, but it would also run cooler.* Also, if it was clogged enough to make any difference in temperature, you'd have a noticeable loss of power. At risk of sounding like an ass, I think it's all in your head. The bike, stock, already runs so lean (and hot) that if it were running lean enough for the exhaust to get hotter, it wouldn't run at all. Just my two pennies.
*Edited to add: the only way in which excess fuel would cause the cat to get hotter is if there was also excess oxygen. The only way that would happen is if the bike was misfiring. And if it was misfiring, you'd notice. Simply running rich due to being clogged would make it run cooler.