Standard Flex Coupling w/ Inner Braid Liner, 2.5 I.D. x 8 Long Description Standard Flex Coupling w/ Inner Braid Liner, 2.5 I.D. x 8 Long Material Bellow, Braid and Inner Liner 304 Stainless Steel End Cap Aluminized Steel Warranty One Year Limited Warranty Flex Dimensions Inlet Diameter - 2.5 I.D. Outlet Diameter - 2.5 I.D. Flex Length - 8- Vibrant flexible couplings are engineered to isolate vibration generated by your vehicle's engine, thereby relieving stress on the exhaust system. - Flex couplings reduce premature cracking of manifolds and downpipes and help extend the life of other components.- The inner braid liner protects the bellows from premature failure and is ideal for eliminating exhaust whistle.