I am not sure they have any powdercoat good for exhaust manifolds?
I know they have a few different temperatures of powdercoat, but not that hot.

For exhaust manifolds the temp cold be around 1,000 degrees. I had mine ceramic coated, looks great, and is supposed to last a long time.

No sure ceramic coating brake calipers would be a good idea, as when they get hot you want them to radiate heat to cool off, the coating would hold the heat in, and possibly cook the seals if hot enough?

For the real answers call a powdercoater, and or a ceramic coater.
This is the place I like for ceramic coating: http://www.performancecoatings.com/performancecoatings.html

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-