Generally I think Diesels have the highest value cats.
And the bigger the engine the more value, as well as anything European...

But it pays to check the numbers anyway. If its a good cat that can be resold, better $.

Also, I think you need to 'rechip' the engine if you remove the cat.
From what I can figure, the engine will use extra fuel at certain times to 'burn out' the oxides from the cat, in some clever way.
And then oxygen levels or something get all screwed up if there's no cat, or oxygen sensors where the cats were.



My cars a 1996 model. The last of the 'old schools', for a reason.