Hey bud, :welcome1:to Powerstroke.org!!
As far as the cat goes.....some had em some didn't from the factory. Someone else should comment on the dates and pattern of which do and which don't. I have heard someone mention it on here a while back, I just don't remember what it is. :shrug:
Now...I have been told...In order to find out if you had one from the factory or not, look at one of the stickers under the hood. One of them will say the word "catalytic" or "catalyst" on it some where if you had a cat on it from the factory. It will not mention either of those words if you never had a cat on it from the factory.
Like I said....That's what I have been told. It is true for mine. 02- I know it never had a cat, and it has no such words on the hood sticker.
As far as legality...if it had a cat on it, it's supposed to still have one. If it never had one, you're good, you don't need to install one.
So that I don't muddle up your thread with this, I am going to start a new thread to prove or disprove this theory. I am curious if it is really true or not.