And if you really want things to run right, rip out the OIL cooler while you are in there. he oil cooler runs coolant prior to the EGR cooler. The oil cooler has very small passages for coolant and if you have any coolant debris, it clogs. So, the solution is:
-Complete EGR system removal (this requires an up pipe with no "Y" in it so that exhaust gases go directly to the turbine (no recycle to intake); it also requires re-routing the coolant as Stephen said)
-complete oil cooler removal. This requires a modified flow plate for both the oil and the coolant. Obviously, you still need oil cooling, so you will replace the POS stock one with a frame-mounted high-performance one. Re-run a few lines and you have great oil cooling and great coolant flow.
-add a coolant filter system. Youve probably seen the posts of guys who have added one and then taken pictures of the crud they collect. I am talking about a handful or two of sludge ollected after just a few thousand miles. This is crap that the system releases over time that stay in there for the life of the truck if you don't clear it out. After the first major removal, subsequent ones are lighter, but there is no wonder why we have cooling problms when you combine this with the narrow passages in the oil and EGR coolers.
So, EGR ystem, oil cooler and coolant filter. Those 3 modifications eliminate a world of hurt down the line and open the door to long-term, higher performance.
Ralph