I love my truck because it has literally NO emission controls from factory. Why do you think these engines ran so long? Yes, they are underpowered, so they can't really hurt themselves. However, emissions crap also puts extra load on the engine too. Just look at the problems encountered by the 6.0, 6.4 and even the 6.7. Do you really want that in your truck?
I used to work in the Alberta oil patch for a company that ran a fleet of cement pumping units. They were either cab & chassis setups, or tractor & trailer. The number one reason they had a truck in the shop was due to emission control malfunctions. It was so bad that we started toying with the idea of refurbishing pre-tier3 vehicles to keep the older, more reliable engines legally on the road.
And then there was the proprietary software that CAT and Detroit ran on laptops that would often crap out halfway through the repairs. I was the instrumentation, controls and electronics tech of the shop so I got roped in to help on many occasions because the mechanics were swamped most of the time. I learned a lot while moonlighting as a HD mechanic, but most of all, I learned just how complex and unreliable the Tier3 emissions packages were. Made me love my truck even more.
Montana looks stunning though. Please don't let the dems ruin it the way they did cali.