you can always look inside the cats from the resonator end to see if it's solid, if you can hear crap rattling around empty them out and be done with it, that way it looks like it has cats and you pass visual inspections

Quote Originally Posted by Kamil
winfred - with more than 230k miles and a really rusty, but not yet leaky, potentially original, muffler, should I be thinking of replacing the cat?

When I hit the cat (or the cover around it?) it sounds "dead".... in other words, it's like hitting a piece of wood and not a muffler... effect is that, you feel like you're squishing the stuff inside upon the impact; does that make any sense?