What else could it be? EGR, PCV? How do I know if it is the cat?
I don't think the EGR Could be bad. It's a much higher chance that the Cat is bad if your o2 was bad before.
If the smell is unburned gas I would check spark plugs and other things related to the ignition system. Also check for a small gas leak. Someone might have replaced the fuel filter and not used new washers, etc.
I'm hoping that one of the other guys more knowledgable in Hondas will be able to better answer your questions.
I'm having a difficult time finding a CAT online for your car, but I'm going to keep searching.
Wow, that's awesome! Glad to hear you made it home ok. Sounds like you were only about 25-30 miles from my place when you were in Granger, IN. I live about15 miles South of Elkhart(St. Rd. 19) then west 1 3/4 miles. I always thought we had some pretty nice people around here.
Horsepower is how hard you hit the wall, torque is how much of the wall you take with you.
There's no post cat o2 sensor, but yeah, it could be a dead cat, you could prolly get one from someone, I have a friend that prolly has a spare left over from when he turbo'd his vx. I'll email him now.