XUD is an entirely different kettle of fish, the pre-combustion chambers put a lot more heat into the head and therefore the coolant.
I've heard that the egr cooler can make a big difference, but i've yet to test it. I certainly didn't notice much change when i blanked mine, but then it wouldn't have had much gas flow through it anyway being as blocked as it was lol. If you didn't want egr but wanted the heating you could probably replace it with something like a water jacket on the downpipe with a thermostat controlling flow, hell of a lot of work for quicker warm up times though. For now i reckon somebody needs to properly record what happens when they fix their pre-heater circuit. Or when they blank their clean egr.
I've heard that the egr cooler can make a big difference, but i've yet to test it. I certainly didn't notice much change when i blanked mine, but then it wouldn't have had much gas flow through it anyway being as blocked as it was lol. If you didn't want egr but wanted the heating you could probably replace it with something like a water jacket on the downpipe with a thermostat controlling flow, hell of a lot of work for quicker warm up times though. For now i reckon somebody needs to properly record what happens when they fix their pre-heater circuit. Or when they blank their clean egr.