As I understand, there's a (temp?) sensor in the mixing pipe that expects to see an EGR charge. I don't fully understand it because the pressure in the mixing pipe would be greater than exhaust pressure under boost. EGR is typically a deceleration device anyway so why should it affect boost. Sounds like big brother more than engineering.

I think member oldsouth figured out how to disable EGR in computer controlled Diesels.

Sixto
91 300SE
87 300SDL
83 300SD ... any takers at $1100?