Boost/EGT necessary for 2014 CRD with 3" Exhaust

[Boinzo]

A Dawes valve is basically a small spring actuated valve added to the vacuum lines that control the turbo vanes (and therefore boost amount). It's useful to help flatten out spikes in boost over rev range and also (primarily) to prevent over boost. Over boost (say > 20psi or less even for some) can cause serious damage as well as put your motor in to limp mode.

That's my newby explanation. Others can give you heaps more and better info. If you search for Dawes or Tillex here you'll get about 2 days reading on it.

I would add the exhaust first. And make sure it has a port for the EGT gauge probe to go into.

I found this very interesting as I am looking to add a 3" exhaust to my 2016 GU Patrol, and it was recommended that I put in the Boost Gauge and a pyro gauge first. I will most probably look at an ECU remap as we will be towing a Tvan on a long trip later this year to the Kimberleys and beyond.
Can I ask what is a Dawes