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I need a new Cat for my 1993 Ford f250 351 5.8. I was on Rock Auto today and there are a bunch of options ranging from $80 to $500. I don't know which one to get. Also what are the two emission lines that come off the top of the CAT called? I need those too
Look under "emissions" for the pipes you need. Probably called Air injection pipes.
As for the cat look on your door sticker and see if your truck is under 8600lbs weight or over, that will narrow the cat choice down some. You will also have to look at what you already have and try to match it to the pics.
Or you could try partsguyed.com or 1ATony who could probably identify what you need (both from the list of sponsors).
If you are in California you are screwed further.