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The light-off segment of the automotive Federal Test Procedure (FTP) cycle is receiving considerable attention because of the contribution this portion of the test makes to the overall emissions of the automobile, now that the emissions during the remainder of the cycle have been virtually eliminated. In order for the precious metal catalyst to react quickly to the temperature of the exhaust gas and reach conversion temperature as quickly as possible, the effects of all other heat sinks in the system need to be minimized. With the overall heat capacity of the system in mind, there have been several papers published in the past 10 years which analyze the heat capacity of parts of the catalyst system. Unfortunately, there are differences among the values for both specific and substrate heat capacity when all of these references are compared.