Is it normal for my exhaust manifold to glow red?

In most unmodified car engines it is not normal to see the exhaust manifold glow red.

If there has been modifications done to the engine then it is not uncommon to see the exhaust manifold glow red. This occurs when the ignition timing and fuel mixture are changed causing an excessive amount of heat. Enough heat to make the exhaust manifold glow red.

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