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Can't answer that. That's all that I found, sitting there just like that.
It has got a wire from it going to the white non GM 3 conductor inline plug, that looks like it might have plugged into an aftermarket radio. I could use my imagination, but just wondered if anyone here had ever seen a contraption like that. There's a wound copper wire coil in there.
It's an aftermarket noise suppressor. It is basically a a capacitor to ground the noise harmlessly. This is usually done when crappy ground is used for the sound system.