[Machiavelli]

Richard,
I should elaborate on my last post a little -

With regard to the headers only, will just an outside coat be sufficient to alleviate the heat soak concern? I know that typically when you get your headers coated, it's an inside and outside job.

For the side pipes, yes - the inner tube to outer skin would be the thermal conduction path, no doubt why they say Yes, it does get warm, there is no way around that ... But if I were to guess why his design works, I would think because the whole outer skin is one large heat sink relative to the weld area conduction path. Looking forward to seeing the technical details.