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Exhaust noise of automobiles is one of the major sources of noise pollution. Un-muffled exhaust noise is quite higher than other noise sources of automobile. Therefore, the use of an exhaust muffler is prompted by the need of engine exhaust noise reduction. Insertion loss is the key metric to evaluate the performance of any muffler and it mainly depends upon proper selection of muffler volume which is proportional to engine swept volume. Another major performance evaluating metric is backpressure. Also, shape, size, weight, durability, manufacturability and cost are the secondary but important criteria of muffler selection. Presently, there are many variants of exhaust muffler, having different overall performances (i.e. insertion loss, backpressure, shape, size, weight, manufacturability and cost) used for different variants of commercial vehicle, though engine swept volume is same for all.