The internals of the cat on my 97 decided to fall apart. The exhaust had already been re-done by the PO with a single cat. I called a local shop and was quoted $250 for a new cat. Guy told me it had to be OBD compliant and that drove up the price. I remembered a lot of the 60/62 guys getting cheap cats from Summitt, so I checked and they've got one for $66 and it's even OBD compliant. I can't imagine it'd be more than $20 to weld it in. Anyway, just a thought for anyone that needs a cat (or two) replaced.