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With the advent of stricter emission norms such as Bharat Stage VI - Phase I and II, the design of the exhaust after treatment system becomes crucial for the internal combustion engine. Inadvertently, the size of the after-treatment system also becomes bigger to cater to the latest emission norms, which leads to increased resistance to the flow of exhaust gases through them. However, the resultant back pressure generated in these devices deteriorates the engine performance. Hence, the onus is on the engine designer to design the after-treatment system and the bracketing concept for mounting in such a way that the engine performance remains intact, and the entire system is packaged within the vehicle boundary conditions. The after-treatment system experiences severe vibrational loads as well as thermal loads.