The muffler of automobile exhaust muffler mainly adopts porous sound absorption material to reduce noise. The dissipative muffler is formed by fixing the sound absorption material on the inner wall of the airflow passage or arranging in the pipeline in a certain way. With the sound wave entering the dissipative muffler, part of the sound energy is converted into heat dissipation energy by friction in the pores of porous materials, so that the sound wave in the muffler is weakened. The resistance muffler is a pure resistance circuit. The sound absorption material of the muffler ZP100 is very similar to the resistance. So people call this kind of muffler resistive muffler. The noise elimination effect of the resistive muffler is poor in both medium frequency and low frequency environments. The anti-interference muffler is composed of a tube cavity and a cavity with a sudden change interface. It looks like an acoustic filter, similar to an electric filter. Each cavity with a tube cavity is a filter mesh. The air quality in the cavity is equal to the inductance and resistance, which is called sound quality and sound resistance. The volume of air in this chamber is equivalent to the capacitance, which is called acoustic compliance. Like electric filtering, each tubule chamber has its own natural frequency. When the sound waves with various frequency components enter the short pipe, only the sound waves of specific frequency near the natural frequency of the mesh can pass through the mesh to reach the second short pipe orifice, while the sound waves of other frequencies can not pass through the mesh. They can only reflect back and forth in the chamber. Therefore, we call it the acoustic filter which has the filtering effect on the acoustic wave. Select the appropriate combination of pipe chambers.