"Disconnecting" the EGR valve will lower the production of soot inside the cylinders and intake by a significant margin. The proof of that is your oil will stay clean for a while after you change it vs it'll get immediately black after a short drive with EGR "on".
The only question is how the DPF will hold up with time and miles if not reprogrammed with EGR "off".
Ecotune very nice gains btw! What is the eco setting? Can you have both or you choose one when remaped?
Retired: 2005 N52 E90 330i Sport 6AT
Retired: 2007 N54 E92 335i Sport 6AT
Current: 2012 M57 E70 X5 xDrive35D