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An important segment of power system design often left to the Original Equipment Manufacturer (OEM) is the engine exhaust system. The requirement of exhaust after treatment has increased the importance of exhaust systems to be impermeable and still retain their physical flexibility. To achieve the necessary flexibility, OEMs will often choose to incorporate an available expansion joint(s) into the exhaust system. Often, conversations with expansion joint suppliers result in the OEM having to supply vital information about the application or a vehicle to record acceleration and vibration information. Unfortunately, the cost of building low volume vehicles does not always afford the OEM with enough resources to develop a custom expansion joint for the exhaust system. As a result, it is important to understand what the proper inputs are, make a sound engineering judgment as to what the worst case magnitude may be and provide that information to different suppliers.