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What engine does you have in your '81 Pick up?
Normaly every gas operated engine has a catalytic converter since...1970, I think, but it's possible, that the previous owner has pull it off.
Jens
It's 1976 here in California. It also depends on what GVWR the vehicle is as well.
In California, 1981 F-100, and F-150's with the 300 I6 not only had Catalytic Converters, they had computers too.
1981 F-250's with the 300 I6 had cats but not the computers.
1981 F-350's, and up with 300 I6 were non catalyist or did not have cats or much smog at all.
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