My 1998 Land Rover Discovery 2 TD5 still had the EGR components fitted and operational. I have read a lot about the usefulness of exhaust gas recirculation and have come to the conclusion that if working correctly EGR can possibly give improved efficiency on a petrol engine, on a diesel engine it only has negative effects on efficiency and engine life. I investigated the possibility of totally removing the EGR components, but decided instead to just block the outlet from the exhaust manifold.