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[jimmy]

The perf mods for gassers have been available in emissions legal form for several years.
Due to loose control on diesels we have been spoiled with extreme increases from mods. If (when) there is enforcement on diesels, the mods will be way less extreme or WAY WAY more expensive. I would think a new high flow DPF to enable LEGAL increases of 150 HP/200 ft-lbs is going to cost a LOT.
Big gains on gas motors always was costly and now we may have to ante up for big gains on diesels.

Now for my stump speech: if we just disregard the emissions and mod trucks, there will be a day that we or our offspring pay the price.
If tailpipe emissions had to be carried to the curb and hauled off for a fee like garbage, our behaviors would change quickly. Since tailpipe emissions don't show up in our yard or in our house (well someone reading this may live in their garage, this part about "house" may have an exception...) we easily forget about them.
I am 48. I grew up in a time when we poured antifreeze and waste oil in the storm drains. In a little town in NY they spread old transformer oil on roads for dust control. Many industries released byproducts of their manufacturing into creeks and rivers. We learned from those things.