NOX Box
Dan,
I’m thinking it was a 70’s thing in California.
In order to pass smog you needed to attach this ugly item under the hood and connect as instructed on the box.
I saw many of these back in the day and I have this nice example from years gone by.
My ‘66 still shows the outline of this decal on the inside of windshield.
I found an old decal years ago and temporarily glued it to the outside as an example.
Also found several new ones on line too.
Chris
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