Mild steel exhaust manifolds can be treated by painting them or aluminium spraying. The spraying leaves a slightly rough coating but it lasts!
There are several companies who paint them with very durable coatings which do not dissapate heat, the heat passes down the exhaust pipe which helps efficiency and reduces underbonnet temperature.
HTH
David
There are several companies who paint them with very durable coatings which do not dissapate heat, the heat passes down the exhaust pipe which helps efficiency and reduces underbonnet temperature.
HTH
David

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