Will blanking off the EGR (exhaust gas recirculation) valve improve my Discovery 300Tdi’s fuel consumption and possibly improve its performance? And is removing the catalytic converter and front pipe an easy job?
Trevor Liggins, Sheffield, South Yorkshire
Both are easy to remove and doing so won’t affect the MoT, because some 300Tdi Discos didn’t have them fitted from new. The front pipe can be replaced with a non-cat version (£51 from paddockspares.com), while EGR blanking plates (about £7) are readily available from many of our advertisers. But you won’t see a big improvement in power or fuel consumption if the existing cat and EGR systems are working properly. And bear in mind that both are there to lower emissions.