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On the 2003-2007 Dodge Cummins common rail there are a large number of pistons "sticking" or failing. This is especially the case on 2004.5-2007 years. One main reason for the engine failures: Common rail engines have a different exhaust manifold than the older style engines, and they have a significant flaw, in exhaust flow, on the back three cylinders, especially cylinders 4 and 5. If you look at the stock exhaust manifold cylinders 4 and 5 actually blow directly into each other. When a …