This lecture/laboratory course focuses on the diesel engine accessories that aid in the enhancement of engine power, performance and lower diesel emissions. Topics discussed include air induction and exhaust systems, turbochargers, superchargers and engine braking systems. A thorough discussion of diesel engine system preventive maintenance and inspection practices are also included. The laboratory component of the course includes various activities that follow the guidelines of the National Technicians Education Foundation (NATEF). A library/internet research written project concerning some aspect of a diesel engine’s air induction system, exhaust system, turbocharger, supercharger and/or an aspect of preventive maintenance and inspection procedures will be assigned and is an integral component of this course.