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I'd consider SSI's, but there's still a substantial cost difference compared with the options described so far.
In general, I'd recommend ceramic coating. Exterior surface temperature will be lower thus reducing heat transfer to the engine. I've measured exh. pipe surface temps of 400ºF under the lower valve cover (early 911), and that was only at idle. I'll bet it's higher with a cat. system. Who needs more heat to reject from the cooling system? If pieces are also coated internally, CC will extend the life of the base material, whether it be plain steel or stainless. Prepping the surface is important. Your system must be sand blasted to clean base material. The CC shop should provide this service.
Sherwood
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