the most easy broken part are that close to the exhaust part. take lot hit and vibration shake. but the end of header tube are not much . can use very thin metal . that's the Idea . the 90 degree part that connect to the flat are 1.2mm . about 3 time thickness than KS uses. make it strong and not easy to broken . compare with aluminium. stainless steel are little difficout to reless the hit , so need quite thickness to build this parts to keep it strong