exhaust gas recirculation flow

Hi all, Has anyone bought and fitted an aftermarket DPF filter for a 1.9 CDTI?? If so what are they like, do they work and for how long and how did they tell the ECU to re set the ash content figures and that a new DPF has been fitted to prevent soot being dumped straight into the new part...

Hi, hoping someone can help. I have a Vectra SRI 2007 CDTI and the engine management light keeps coming on. Although I have reset it myself it keeps giving me a fault code P0400: Exhaust Gas Recirculation Flow. Because this can be linked with the EGR valve I was going to get a Carbon Engine...