Just a thought on this...
Last year, I had all of my intercooler piping powder-coated gloss black. They looked BEAUTIFUL, except that they would get smudged and scratched so easily. If I was working on the car, and I brushed my arm against the pipe - smudge. If I tried to wipe-off the smudge with a rag, I would get hairline scratches. The only way to clean them of was to use car polish. Quite the pain.
I recently had the pipes stripped and re-coated with satin black. The difference is that satin black is a urethane-type coating, where the gloss was a polyester coating. The results have been great! The satin black does not get the scratches and smudges like the gloss did, and everybody that's seen them so far has liked the look.
I can post pics if anybody cares...
PS: I had my pipes done by J.B.'s Powder Coating (a.k.a. John Butler) in Indiana. His work and effort to get my pipes done were both top-notch. Highly recommended.