Anyone build their own headers

these are about the 5th set I built and i helped earthmover with the set he tossed. I have about $3000 in them. they are for my supercharged 512", custom flanges build to the head ports. 2 3/8" for 6", 2 1/2" for 6", 2 5/8" to the custom made collector which is 5" and 18" long.