Ceramic spray paint works great, just make sure you fire those headers up after you paint them to cure it. I did mine in white and 2 years later I took them out and when I chipped the paint off it was clean silver and it was hard to chip it off.
I thought about blowing a leaf blower past the collector (Venturi) and spraying an aerosol ceramic spray into the primaries because the powder coater could not get his ceramic very far into the tubes. Good to know it works well.
