I'll repaint this winter
I did mine with VHT Flame Proof spray paint. Cleaned, primed (VHT primer is sold in a spray paint can with a grey cap and subtle sticker on the back), baked, painted, baked, installed... Already got some rust creeping through under foot (and I thought I did a fine job of prep), but the paint hasn't burned one bit at the headers.
I think when it gets bad I'll strip em, heat em up real good, and douse with oil before wrapping with tape.
You could also drop some serious flow and get the pipes ceramic coated 8-)