I agree with you guys about all the smoke blowing tards, like stated above this "coal rolling" business seems like something thatll show up in the latest fast an furious movie but at the same time its MY $50,000 truck an i will do with it what i please, i dont take part in blasting people with smoke but i know ALL of us have been there before. If you wanna blow smoke everywhere fine! Make big fines for it like street racing, parents will only pay there teenagers tickets so long before they take the truck away. Problem solved. What im getting at is there is far better ways to handle this problem then just having the feds continue to over step there bounds with regulations, when will it stop? It wont. If the feds are so interested in more revenue then law enforcement should start writing big tickets for exhibition of smoke like the do out here in cali, its up to the truck owner to operate his vehicle responsibly, and if not face the fines an move on, there are so few diesel vehicles out of compliance out there by comparison, there time would be better spent making all the now legal marijuana smokers in Washington an Colorado have to smoke through a dpf rather then my work truck for my business!