Ceramic is your best choice. The xternal coat helps keep underhod temps down, as bakeoff mentioned, and internal coating helps keep exhaust velocities consistent (hot air moves faster than cold air). I'm thankful most import pilots don't know Holley, or thet they even make Honda parts... Holley Airmass triple JetHot coated 4-2-1, eBay cost: $76. An identical DC Sports that was ending within two hours of mine went for $240. Got a hearty laff out of that one.