??Why is my car so noisy ??      Here??s the short answer: exhaust. When your engine burns fuel, your exhaust valves open to release highly pressurized gas. The noise is a result of thousands of sound bursts per minutes traveling down and bouncing around your exhaust pipe. Your muffler??s job is to cool the gases and reduce the noise. 
??How does the muffler minimize noise??      Most cars have a muffler mounted in line with the exhaust pipe. To minimize noise, a muffler uses perforated tubes or baffled chambers. When the sound waves travel through these chambers, they create opposing sound waves that partially cancel out the original sound waves.
      Engineers can create a number of potential sounds or weaker sounds by modifying the muffler design. Think of a musical instrument that??s designed to play a higher or lower range of notes. 
      The same thing is possible for your vehicle??s sound waves. 
??How does the muffler affect vehicle performance??      The exhaust system as a whole affects the overall performance of the engine. The faster the exhaust flows through the exhaust system and out of the car, the quicker the engine can take in the new oxygen necessary to burn more fuel. A highly efficient exhaust system creates the possibility of a very powerful engine and a very fast car, which is why it??s such an important component.