No. You have to remove cat from tailpipe. If you simply go thru tail, you will need a very long piece of rebar, and break muffler baffles, first. To empty a cat usually takes drilling hole in bottom or opening a plug. "Honeycomb" type you describe will take a star rock drill aimed in back or front, with a 3# hammer or sledge. You may have to saw it loose or get the clamp faces red hot--they well be rusted in there, if not welded. There is a scoop type remover just for getting stuck mufflers off:
I've heard of letting gas tank get real low, then adding as lot of that "octane booster", getting car good and hot by a 250 mile drive on freeway. The added heat to cat burns out any scale or carbon and fixes it.
Don't throw away any parts you get out, they are Platinum. A dead cat is worth $100.