[carsonmx114]

i live in alabama, i just cut it off and put a pipe in it's place. i'm going to replace it though, it's to loud now and it stinks when it's idleing. you may know, but the inside of the cat is a honeycomb ceramic that gets red hot when the engine is running to burn off any unburned exhaust, this ceramic material sometimes breaks apart and that's what rattles around. most aftermarket cats have pellets in them instead so i don't know how well they will flow. if your cat's broken apart inside it will have to be replaced, or i have seen people take them off and break the ceramic completly out to make it hollow. anything short of replacement may be a problem for you if your state has emission tests.