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This webinar gives an overview of exhaust aftertreatment modeling capabilities in GT-SUITE, including presentation of real world examples of exhaust aftertreatment models. Motivations for modeling are discussed including minimizing the precious metal loading, pressure drop, and tailpipe emissions, as well as optimizing the sizing and layout for fast warm-up and meeting packaging constraints. Trade-offs and complex interactions can be studied in detail, including interactions with the engine due to different injection strategies, dosing strategies, etc. Finally this webinar discusses how the aftertreatment model, and other application models such as the engine and vehicle, can be integrated into a single system level model for use with XiL (MiL, SiL, and HiL) systems.