Hi all, just joined this forum, so please treat me gently. The better half has a E220 CDI, Classic A, WDB211, around 120k miles on an 06 plate, which just started to lose power and not going over 3000 revs. Occasionally will start and initially run OK but soon goes back into safe mode and the EML is on. Had a local indie look at it and they have advised both cats are blocked and genuine MB ones are around £1000 each Had a look at a couple of sites and europarts do them for around £200 each as do Autobits. Can anyone recommend either, or something better, or do I need to stick with OEM ones? And, are they easy to change??