[kgordon]

They can and do reach a point where they fail. Though i would think the average is around 125K or more. That said, i had one fail on my 2011 last spring. It was fixed under warranty and i am not really concerned that the others will fail early.

You don't say what kind of truck you have but you could and probably have 4 cats. If one of the front cats goes it will put more strain on the secondary and you should get it fixed as soon as possible as it will impact the longevity.

 

[kgordon]

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Yeah, I think I'll end up just spending the money and replacing both cats with CARB approved OEM parts. Total bummer on how expensive it is.

Do you know that both are bad or just one? I would only replace one. No telling how long the other might last. Take that money for the second and put it in the bank and save it for when you need it.