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Take a look at your numbers, although not failing in all catagories your numbers are high across the board. You definitely would benefit from a cat but I would check out the O2 sensor as well. It should have a rise time of 100 milliseconds, it should be able to sweep from 0-.9 volts in 1/10 of a second. If it fails to drop all the way to 0 or go all the way up to .9 or it cannot do it in the specified time frame then you have what is reffered to as a slow or "lazy" O2 sensor. If you do not have the equipment necessary to diagnose it then you might want to look into just replacing it with a new Bosch sensor and move on. A new cat and a new O2 sensor will usually fix a car but often times the vehicle will have other problems and the cat and sensor will simply mask the problem long enough for it to get through the inspection and then the new cat will fail shortly thereafter from having to much crap and crud run through it. This is what we in the industry refer to as a "clean for a day" repair. The numbers you are posting do not indicate that you have a problem elsewhere but without actually seeing the car it is impossible to tell. The catalytic converter is simply meant to clean up a slightly rich condition, it is not a garbage disposal unit and using it as one will greatly shorten it's effective lifespan.
Mark
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