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Boost on Patrol ZD30 is computer controlled and under certain conditions the computer will reduce boost to allow the EGR to work, this has the effect of reducing power and sooting up your engine internally. Technically speaking the purpose of the EGR is to reduce NoX emmissions.
Fitting a dawes and needle valve set up takes boost control away from the computer and allows for a more linear boosting, more like a standard wastegated turbo charger. (Patrol ZD30 uses a variable nozzle turbo and vacuum solenoid instead of a conventional wastegate like Navara ZD30).
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