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More and more automobile manufacturers are requiring a typical sound pattern for a car or a platform, even the unique „brand sound” for a whole brand, on the top of their specification. By this image factor sound design becomes increasingly important for the exhaust system development. The whole sound pattern, especially the tailpipe noise of the exhaust system, plays an important role at the subjective impression of the car [1, 2]. There are two sound classifications: the limousines with an harmonic, quiet and discrete sound whereas for sports cars a more rough and powerful sound is requested. Compared with the gasoline engine the diesel engine has, based on inner power driven processes, a minor sound spectrum because its harmonics and main orders are hardly audible and mostly attenuated by a turbo charger. For turbo charged engines special concepts have been worked out in order to achieve a sporty sound.

HyTRAN - Hydrogen and Fuel Cell Technologies for Road Transport, a project under the auspices of the European Commission's Sixth Framework Program for Sustainable Development, should advance the fuel cell technology towards commercially viable solutions by developing components and systems and to integrate the subsystems into innovative, fully integrated and compact Fuel Cell Systems. The project is divided into two technical platforms: 80 kW Direct Hydrogen PEM Fuel Cell system for propulsion of passenger cars 5 kW Diesel Reformate PEM Fuel Cell Auxiliary Power Unit (APU) for truck on-board power supply TENNECO is playing a central role in this project. One of TENNECO's key tasks is the full system integration of the Fuel Cell APU. In a first step the system was integrated virtually with help of CATIA V5. In a second step, TENNECO is building the prototype, based on the results gained from the virtual integration work.