The 'EXHAUST VALVE DXDV' is a crucial part of the exhaust system for Citroën models ID/DS from the construction years 1966 to 1968, type DX/DV. This valve controls the flow of exhaust gases from the engine to the exhaust system, contributing to efficient combustion and reduced emissions. Over time, the valve can wear out, leading to decreased performance or increased emissions. Replacing it can restore overall engine performance and ensure a smoother, quieter ride. These specific replacement parts are designed to seamlessly fit into the existing engine configurations for optimal results.