people don’t put headers on a cruiser, they put headers on a engine that’s been messed with.
Pulse aka cam timing, tube Lengths, size, and collector merge has more affect than scavenging…. Tell me how zoomie or top fuel headers scavenge… Exhaust is the by product of sucking in air in your lungs and then blow hard… how’s the garden hose scavenging the air from sucking on it and blowing?
My cooling system is so good, I have problems getting the car over 190. So yeah, the coating make no difference, header wrap may, but I’m not wrapping my newer headers…
So yeah most of what you’ve heard in poop….