I have 137k on my 94 Explorer and the entire exhaust is 100% original, from the manifolds all the way back to the tailpipe. I haven't felt the need to replace any of it. The only time I would replace it is if it were rusting out, clogged cat, etc. In other words, if it actually NEEDED to replaced. If it ain't broke, don't fix it.
If your a short shot driver cat, mufflers ect will rust out faster then if your longer destination driver. Short hops do not get the system hot enough to evaporate the moister from the system
You should be fine up until at least 200k. Like stated before, I see no reason to change it out unless you had it plugged up or it was rusting out. Invest the $ in good performance exhaust instead!
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