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Por 15 makes a header paint. I painted some 914 1.7 headers about 10 years ago. I saw them at a swap meet 2 years ago and I was amazed how well they looked. I painted my premuff (exactly like yours) and it has turned a nice tan color like stainless steel does. Not pitting. The paint is called "factory manifold gray".
Ceramic coating is pretty amazing. On this 914/6 I saw, the owner told me to put my hand near the headers to feel the radiant heat, but to be careful around the muffler because that was not coated. The car had been sitting for 10 minutes after a run. The muffler would have seared flesh on contact. The headers were coated in and out and I could touch them briefly.
There is actually a coating that radiates heat that you can theoretically put on the fins of your cylinders. It's a thermal dispersant coating to help shed heat. I heard it was very expensive. It's a product used to paint military vehicles for some type of IR camoflage. Not sure how that works.
Black BBQ flat paint is an old VW racer trick. You coat the jugs and that helps dissipate heat better. I tried it on a 914 and it made the jugs look better at least.
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78SC coupe, Silver Metallic
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