Keep in mind that most ceramic coatings on headers do eventually come off and headers with that coating is not going to last forever and headers tend to eventually rust.
Ceramic vs stainless headers.
Stainless will radiate more heat into the engine compartment than ceramic coated headers will.
I had coated headers on my lt1 camaro and like one of the other posters accidentally bumped into one of the primaries with my hand after the engine had run for some time.
Ceramic coating stainless headers is the best way to go.
Even if you are already using a high grade stainless steel or titanium set.
Also since the heat is staying inside the headers the exhaust gases will be hotter and will flow more remember as air cools it becomes more dense.
Stainless headers are normally far more expensive and yes there are ceramic coated stainless headers and company s that will sand blast and re ceramic coat used headers but exhaust gases tend to produce acids if the car sits for long periods from moisture in the air exhaust.
The ceramic actually blocks alot of the heat if they are coated inside and out.
Ceramic coatings can increase performance ceramic coatings can help improve the performance of your headers turbo parts and exhaust pipes.
The old school approach to building headers has traditionally been to make them out of mild steel and perhaps coat them with chrome for.