My catalytic converter is "falling apart", need opinions on what to do Options

[SnowMan]

alrite, not too long ago i picked up an eastern high flow cat,
a resonator, and a muffler. i had meineke bend me some
2.5" pipes and it was great. 2 days ago, i realized that as
soon as i go over 2k rpm's, theres a really nasty rattling
sound. after bringing it back to meineke, i was told my cat
was starting to fall apart inside and that it will only get worse.
obviously i need to change it, but should i get another high
flow, and also would it be worth having them also change
my muffler while doing the work so i can upgrade to magnaflow?

[Galcobar]

And if you understood exhaust flow, you'd know that gutting a cat impairs flow.

As for the suggestion that four-cylinder engines can't put out much pollution -- boy, can I tell you never took a logic course. Think about it, every drop of gasoline you put in your car comes out as pollution. Every single drop.

Me, I like the idea of still being able to see the mountains in fifty years, and not have to worry about wading through a brown haze of ground-level ozone and acid rain. The air's already bad enough when you get a temperature inversion. Why add to it, when you get no effective gain.

Or to put it more simply, before you take out your cat, empty the change in your ashtray. It'll make about as big a difference.