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Without specifics I can only guess. Based on your description I would guess the "Red Hot" is the catalytic converter.
The converter does normally become extremely hot, about 1000 degrees F.
If the car is running poorly and emitting high levels of pollutants, the converter temperature can reach as high as 2000 degrees F. In this case the converter innards will melt and destroy the converter.
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∙ 12y ago
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