ceramic coating, exhaust wrap or bare...?

[zeee]

hope to get some feedback from fellow forumers with respect to aftermarket stainless steel exhaust manifold*. as the title suggest, which would be beneficial, and why, in terms of "engine performance" and/or "reliability". appreciate all feedback, and thank you in advance.

* e.g. gauge 16 t304s, mandrel bent, equal length piping, tig welded, etc.