6.7L Cummins intake tube

Shinner, enlighten me and perhaps others how the DPF works, don't forget to include how the NOx emissions almost double when regenerating or how the EGR system, both on the exhaust and the injection events, add soot and raw fuel to the engines oil and how that increases the shear stability of the oil or how the added soot clogs up oil journals. Or how EGR and DPF systems cause a 20-30% increase in fuel consumption... and JFI my 2005 ram 3500 that I "modded" did not have DPF or Urea from the factory, and we all know Cats don't remove NOx worth a sh#t. So, again tell us how increasing power which is not going to increase NOx?

From your buddy TnP:

Great post ShinerBock and 100% correct in everything you said. You're either a smog tech or someone really in the know.

And just to clear up a few misconceptions for some on here.

Just because you don't roll coal DOES NOT mean your truck engine is clean. That's like saying my big block I race is in perfect tune and does not smoke so therefor it is a "clean engine." Nothing could be further from the truth! In fact a "detuned engine" will be waaaaaay cleaner (NOX wise) than a really good running, well tuned lean burn engine.

There are several types of pollutants that come out of an engine. For a diesel two of the big ones are particulate matter (the black soot you see) and NOX (the stuff you can't see). Both are bad.

Since diesels at cruise or idle are a lean burn engine, they put out a lot of NOX. That's why when tuners really get an efficient burn on the diesel engine the NOX goes sky high but you pick up some mileage. The burn is great and the mileage is great but the pollution is sky high.

When you put a lot of fuel to a diesel to make power without the air to clean things up, they put out a lot of particulate matter. This is also bad but for a different reason as SB has pointed out.

In short there are several types of pollution: Some you can see with your eyes and some you can't see with your eyes. Just because the tune on your truck's diesel engine does not roll coal does not mean it's clean smog wise.

So a diesel bomber rollin coal down route 66 leavin a trail of thick black smoke a mile long is ok, but a truck rollin next to him with no smoke is bad... right. That guy rollin smoke ain't getting enough air and is spewing NOx. Show some data on NOx emissions from guys rollin smoke vs guys with clear exhaust.