Exhaust gases are generated from the combustion chamber after the air-fuel mixture is burnt through the Power Stroke. These exhaust gases are "thrown out" in the combustion chamber through the Exhaust Stroke. The exhaust gases, including NOx, move through the Exhaust Valve, the Exhaust Passages and finally towards the atmosphere over the Exhaust System. Installing Bellowed Up-pipes on the diesel truck is the perfect treatment for the much too common diesel exhaust leak. The stock Ford up-pipes are made employing a crush donut gasket to seal the up-pipes to the y-collector. Over time, expansion and contraction make the donuts to leak, hurting engine performance and mileage. I found this book, and the entire Earth Life Series, being powerfully transformative. Written simply and lovingly, these teachings ring as true today while they did at publication in 1986. These are the same truths every master from every era taught, updated for modern time. They deal specifically with the everyday thoughts and circumstances we face now.