Header wrap is supposed to reduce under hood temps, then explain this. I have my headers wrapped with the fiberglass wrap, wrapped correctly, and for the heck of it I got out the laser temp gun. I point the laser at the narrow section of unwrapped header pipe where it comes out of the head flange got roughly 280 degrees on all the pipes. Then I dropped down a couple inches onto the wrapped section and every pipe read 125-175 degrees hotter. What's the deal?