The topic of performance testing followed by the presentation of modern emission test procedures is, for the first time, dealt with in depth and scope never seen before and both topics have been deliberately coupled. For example, the meaningful measurement of a vehicle s C02 emission only makes sense with a complete mapping of the rpm range. On the other hand a dynamometer and the appropriate operational infrastructure in conjunction with a modern emission test unit can be an extremely valuable diagnostic tool. After a brief introduction author Florian Vierling describes the historical beginnings of dynamometers moving on to present a comprehensive overview of various design and variants as well as the physical background. As a follow-up Vierling concentrates on design and workshop technical general conditions. The actual performance test is described in the next chapter. Vierling thoroughly examines several topics including the interaction between rollers and vehicle tyres, the proper securing of the vehicle, the noise insulation, the issue revolving around Automatic or 4 wheel drive vehicles as well as possible differences between live and OBD data. The book is supplemented with application examples dealing with topics such as performance optimization (including an example from ABT Sportsline) and optimization of emission behaviour or consumption. The book is rounded off by offering a view of future challenges.