Quote Originally Posted by Martin View Post
Not everything will be cooler, the turbo internals and the down pipe should be hotter - that's what I was referring to needing to be engineered for the extra heat
Sorry to disagree Martin but none of the internals can actually get hotter than the original heat source i.e. the exhaust gas. Wrapping, blankets, coating can't make internal items hotter than they already are as the heat, which is at peak temperature, radiates out from the internal source. They may keep the outside surface hotter than standard in some instances, but we are talking about metal surfaces that are designed to take the maximum temperature of the internal heat on it's way through them to the outside world.

What happens with effective thermal insulation is that the exhaust gas retains more of it's heat (doesn't lose as much to the metal surface then outside world), which helps it flow better & actually extract more of the heat from the combustion chamber & exhaust manifold etc so that in practice the external surfaces run slightly cooler than standard.

With respect to wrapping it does retain moisture over time & will rust through pipes eventually.