I have a 2020 International MV607 with a Cummins B6.7L and International emissions. International and Freightliner are having problems with DEF sensor failures, some folks have been trying to fool the system, which the system detects, and starts irreversible derate. Requires dealer programming to resolve. Backyard deletes are pretty much becoming obsolete.
I know we are persisting this point of not deleting... it's becoming a point of fact and law. EPA is not the bad guy... no political agenda, much of the Democratic world is doing the same thing. There are countries choking in smog, particularly big cities and industrial areas in many other types of societies.
Most power ever achieved with white ash and water vapor coming out your tailpipe versus smoke and tar. Pretty amazing.
This thread is a great discussion about emissions, and I think we will progress to where folks actually keep emission trucks a long time, and fix them along the way.
Cheers, Ron