Glowing Red Catalyst

I got home tonight and opened my hood to check on the engine and the entire engine bay was bathed in glowing red light from the pre-catalyst thing under the exhaust manifold. The actual catalytic converter itself has been removed but I left the pre-cat or whatever it is in place. For some reason it's getting insanely hot, I don't think it's stopped up because the car doesn't drive any different than normal and has the power you'd expect from a slant 6. The car doesn't act stupidly rich or...

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