I know it has been a while since this thread was hot, but, I am working on this mod today. My question, is, after doing the diode & resistor mod, do I still need to install a blocking plate on the EGR? Should I remove the little piston inside the EGR housing?
Do I plug up the vacum lines coming off the transducer and the other vacum line that is attached to the EGR?

1998 E300 TD
Thanks for reading.