Source? Your numbers are wrong, per the EPA standards manufacturers were required to meet pre DEF.
A bit? The emissions go up by 40 times or so when you delete the emissions equipment. There is a reason why all these different types of equipment are required to be able to run these engines.
Europe has traditionally had more relaxed emissions requirements for diesel, and they are now paying for it. The diesels running everywhere in Europe now create enough smog to block sunlight in metropolitan city centers, and the pollution agencies call it the biggest blunder of EU (besides handling of the 2008 crisis).
Anyway, my point is, deleting these trucks is like operating 30-40 trucks every day; the impact is huge. I don't think it's worth it for 1 more MPG, or more bragging HP/TQ numbers.
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