Because the exhaust gases leave the engine under high pressure, their exit would be accompanied by an extremely loud noise. Because of this problem, the muffler was invented. This muffler basically reduces this pressure of gases so they go out of the tailpipe quietly. It does this by sending the gases through a series of plates, tubes, and holes. The location of the muffler is usually under the rear end of the car and it connected to the tailpipe.