I've been pondering this since taking the IM off to clean it and the EGR is soon coming. I'm speculating that a larger diameter hose all the way back to the tank would be the best "hose" solution instead of say just going with a bigger hose from the metal line on the firewall to the preheater.

I'm not up on the "fluidity" of these things to know. When I get the IM off Ill take another whack at this idea.

Anyone else tried this larger hose concept?

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Treetops
06 E320 CDI 127K Miles
87 300TD 231K Miles

99 E300 269K Miles-Sold