Hooker Headers has taken the hardest part of header fabrication (welding the tubes to the flanges) and done it for you. Each flange has 2'' long stubs welded to it and is machine milled, not ground, to provide a perfect sealing surface. The flange is then internally deburred and heli-brazed on the outside to provide maximum strength. Hooker Headers Flange Kits come complete with gaskets, bolts and a polished stainless steel contingency tag.