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AVL's research program on highly fuel efficient low emission two-stroke engines initiated the development of an advanced cycle simulation program to optimize the intake and exhaust systems and the port timing, as well as the investigation of various fuel or mixture injection systems. The current paper covers the application of the engine simulation program to multi-cylinder engines and presents a summary of the latest test results with the AVL-Direct Mixture Injection System on a 250cc single-cylinder research engine. An analysis of the gas dynamics in the exhaust system of a crankcase scavenged automotive three-cylinder engine is presented and the influence of important dimensions of the exhaust manifold on the pressure wave propagation and on the torque characteristic of the engine is discussed in detail.