another thing to add is if the post O2 sensor does give you problems (basically a light is all it is), you can always send your computer out to get reprogrammed. My brother sent the computer for his Trans-Am out to get reprogrammed and it only ran him around $100-150, but just removing the post cat O2 sensor wouldn't cost nearly that much, my brother had a bunch more done like removing the EGR, AIR, programmed to optimize gains from adding long tube headers, cold air intake, performance transmission and so on.
