A good quality catch can is always a smart idea on a diesel engine. It will help capture a lot of the junk that normally makes its way into the inlet manifold and slowly chokes diesel engines. Have a look at the Mann & Hummel branded Provent catch cans as these are regarded to be the best in the business.
As for the EGR, you cannot simply block it off on a modern diesel without ECU trickery because the car will have a dummy spit.
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