Chris Klenke of Aftermath Diesel Services, Villa Ridge, Missouri talks with DPP's Scott Henrick's about the Cummins, an engine Chris knows a lot about. The conversation spans all generations of Cummins and describes the pros and cons of each. Chris also explains what to look when purchasing a Cummins and the modifications that may best serve the owner's need. The Cummins engine is simple - but complex at the same time.