Right..let's skip all the easy things and go right for new engine. Since you're the one footing the bill...it sounds good.
Technically, it means "Catalyst damanging condition" Which..is usually caused by a misfire.
well i know my cat was going i could hear it while driving real shaky is it a possiblity its just clogged, i pulled all the wires off the coils and they all spark and the misfire im getting is 305