1. Auto exhaust flex pipe 2. Car exhaust flex hose 3. Auto muffler 1.Structure of Exhaust Flexible Pipe: Interlocked Pipe+bellow+outside braid+(extension tube) Inner braid +bellow+outside braid+(extension tube) bellow+outside braid+(extension tube)2.Size of Interlocked metal Hose: 1 1/2",1 3/4", 1/ 7/8",2",2 1/8",2 1/4“,2 3/8",2 1/2"3.Size of Muffler: