I still believe that EGR tubing runs should be entirely straight Cunifer brake tubing with elbows held on with quick release fittings.
Quick “rodding out” maintenance would be worth the slightly higher initial cost.

How many national park lands or nation sea preserves
could have already been bought with the cost of all this DEF fluid, shop repair visits, 18 wheeler tow in costs, etc ?

In the mean time farmers can over apply nitrogen fertilizer which quickly releases NOx into both air and runoff water.

EV fires are in the news, with warnings like:
Li battery fires are super hot, generate their own oxygen, and the vast fumes are mixes of super-toxic gases.

Do EV fires emit NOx ?

How much?