I am seeing a few posts on failed or clogged cats. A while back I saw a post that had replacement cats and I am unable to find it again does anyone recall that post?

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should be easy to diagnose though, depends on the problem you have:

If the car misfires: just undo the upstream o2 sensor and see if the car doesn't misfire when you do, just don't have it running for more than a couple of minutes.

 

I was not looking for one for me. I recalled seeing a replacement cat that was affordable and I am unable to find that post.

 

Gus, try Summitt Racing. Here you can procure an inexpensive Magnaflow hi-flow cat.

 

They're a little over a $100 each...If yours are starting to clogged, be advised that it's high odds you'll need to put some serious heat on the bolts connecting the clogged cat(s) to the exhaust manifolds...