I have an old Dodge Ram with a Cummins 12 valve engine. The next generation version of my same truck came with a 24 valve engine and more emissions controls. Th

I have an old Dodge Ram with a Cummins 12 valve engine. The next generation version of my same truck came with a 24 valve engine and more emissions controls. The 24 valve Cummins engine is famous for the ability to re-tune and "delete" features on the engine for better performance and dirtier emissions. The 12 valve I own only needs a screwdriver to change the fuel mix and increase horsepower. These engines are considered highly desirable because they are very simple with unusual durability (the design comes from Cummins industrial engine product line). When you see the a-holes on YouTube "rolling coal" it is typically from one of these Cummins engines. These are older than the trucks mentioned in this article, but I wonder if Cummins continued to allow easy adjustments to defeat emissions controls.