I don't know. I know that the same approach of EGR was examined and rejected by big marine engine manufacturers on account of the high wear implications of recirculation. Judging by what I saw in my intake pipe above the EGR valve I didn't like it either. below the EGR reentry point it was shiny clean; above the stuff was millimeters thick and on through the intake manifold.
I know that Cummins's approach to the problem has been to keep the charge air aggressively cooled; a huge cooler as fitted on my truck. But I understand that rumor has it that Cummins will be fitting EGR in the nest few years along with common rail injection. I don't like the idea of terrible cold air going into an engine because of the potential for a non-prompt commencement of injection. On Marine engines that we run now the charge air goes in at 80C and there is very little knock due to lag or diesel knock. Many of these engines have their charge air cooled or heated by the cooling water so you can see what I mean
David