This is true even for cast iron manifolds, though becuase of their
greater thickness it is less of a practical problem. One solution is to
have the headers plasma coated with a ceramic material. This can now be
done both inside and outside.
Parkman Kenneth wrote:
>
> Just one comment one wrapping exhaust - under power the exhaust
> temperature is of the order of 1400 degrees F and with insulation the
> pipes get much hotter. Most metals, including most stainless steels,
> cannot cope with this in contiuous use and in time will crack or oxidize
> away. That is why header manufacturers will not warranty and recommend
> against wrapping headers.
> Ken
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