In this new era, noise pollution is very high. One of the reasons for this noise pollution is sound which is generated by the exhaust system of the motorbike. So, it is necessary to reduce the noise coming from the exhaust of the motorbike. In this paper, original silencer reverse engineering has been done, then three modification models of the silencer with its analysis have been done and from those results, one of the modified silencers was selected and it was sent for manufacturing. After fabrication of the silencer, two tests were conducted. First, the test was conducted with original silencer, then it was conducted with modified silencer. From that data, transmission loss of original and modified silencers was calculated and then compared with each other and from that, noise was reduced to 5db. Also, flow velocity of exhaust gas in original silencer and modified silencer were also measured. It concluded that modified flow was increased by 11% to original silencer and also PUC of modified silencer was checked and it was in limit as per the PUC norms.