Why would you want to? The EDC control system is engineered
to operate with a EGR system. What could you possibly stand to gain (other than a cleaner intake) by disabling EGR?
Not to mention tampering with or disabling your emissions equipment is illegal.
The 603 and 606 diesels all use either a MAF sensor, MAP sensor,
or both to cross check the efficiency of the Boost control and EGR
systems. Thats why you loose boost when you disconnect EGR.
Thats also how the engine self checks itself for correct EGR control
and monitoring.

I saw someone with a homebuilt "circut board" and a jerry-rigged
map sensor butched into their car. His motor melted down
shortly after from lack of correct boost control and detonation.
Dr.D