Exhaust system, the least concerned section by the people has the most effective role on the environment as it is that portion of an automobile through which exhaust gases get out from the combustion chamber to pollute the air by their contaminated contents. The exhaust system components like catalytic converter, muffler and resonator make it possible to let out the least possible contaminated gas from the engine exhaust manifold. The performance of the emission control system particularly by the catalytic converter and the noise control are the main concern of this paper. To make a comparison of the exhaust gas emission providing with catalytic converter or not, an exhaust gas analyzer was used to collect experimental data. All the experimental data and graphical representation concludes that the carbon content in the exhaust gas from the car, Toyota E-90 has been reduced to a great extent with the help of catalytic converter & the noise has been reduced as well for the proper attachment of muffler in exhaust system.