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Research within this article investigates flow behavior in an accommodated exhaust system incorporating an Selective Catalytic Reduction (SCR) unit. Discussed aftertreatment system is designed to work in ammonia-rich flow regime. This lead to resignation from urea injection. Due to that research focused on obtaining optimal parameters for catalysis without injecting additional fluids. Instead catalysis effectiveness is considered as a function of basic parameters of exhaust gases mixture and inherent SCR characteristics. 3D models recreated original SCR geometry with porous volume designed explicitly as a 3D structure and as a porous media volume to compare effect on results and computational time. Calculations were focused on parameters to obtain local temperature, speed and exhaust gases composition. It is known that especially composition and temperature of gases affects greatly catalytic effectiveness of an SCR unit. Those values will be further used to predict optimal probes placement, pipes insulation parameters and characteristic dimensions. End goal is obtaining optimal flow conditions for aftertreatment system that can be measured and controlled in full scale laboratory experiments. Most of the calculations were performed within commercial ANSYS Fluent software with simple additional code in User Defined Functions (UDFs) resolving behavior of gases within reactive zones of the exhaust.