To expand on what dj said, the IPR setup can be plumbed a few different ways. I have mine tapped into the heater line feed and returning to the heater line return. As long as I'm not using heat in the cab, it is pretty much a full flow system since the inline valve has the flow stopped to the heater core itself. This setup does not affect the coolant running through the oil and EGR coolers. So, in this situation the religious maintenance is not as critical, but still needs to be done.
Mines like this, right now.
The other option is full flow as well, but would restrict cab heat if the filter became clogged, requiring filter maintenance, but still not restricting oil and EGR cooler flow.
If you opt for the manifold that pulls directly from the oil cooler coolant outlet, filters and returns to the EGR cooler, then religious maintenance is a must. As long as you monitor your deltas, you'll know when/if the filter needs cleaning.
This is with the manifold.
Edit to add: I have the manifold (thanks Merc82) and plan to install it at some point, just haven't had the time lately. It will be a little bit bigger job for me since I'll need to re-plumb back to the the factory coolant routing where I have spliced in the current hoses.