My '07 showed some boost 'spikes' on the scan gauge after I blocked EGR.
Rather than fit Dawes and Needle valves I chose to use the other method and adjusted the Turbo Actuator.
It is a bit fiddly but works quite well and is detailed in the ZD30 Reference Manual.
Blocking EGR is mainly used to reduce particulate matter and oil contamination.
Blocking has no effect at high engine loads as the EGR is normally blocked by the ECU then anyway.
There will be a smalll increase in 'black smoke' after EGR block
Side effect is increased NOx pollutant levels
You can expect to see P0401 codes on the Scangauge if you block the EGR completely
No biggee just clear them as they don't cause limp mode.
If you do get limp mode it is because of boost issues and you will need to adjust the Turbo Actuator or fit Dawes gear
If you are after reduced EGT's when towing then you would get better results with a more efficient intercooler.
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