During installation of a towbar on my 2001 Allroad I removed the rear section of the exhaust to facilitate access. With the exhaust off I inspected my DPF's - the 2.5tdi has 2 of these. As you may be able to see from the photo they both appear to be pretty much blocked (perhaps the photo below does not show it too well, but on the original photo when I zoomed in there appears to be very few holes that are not blocked). The car is running OK with no real suggestion of any exhaust problems, but I think I want to remove the DPF's from the car anyway. I guess the procedure will be to remove the pipes from the car and then destroy the filters using a rod of some description? Are these DPF's meant to be changed at set intervals in the vehicles life? To me I would expect this unless they were self cleaning. Anyway, I guess this post is more for other peoples info than anything else as I have already decided to remove the filters. Maybe I will remove the CAT aswell while I am at it.