Refitting the general drum is the top priority of refitting the car. Because the air outlet pipe is very important for the power output curve on vehicles with high performance requirements, in vehicles that pay attention to personality, the air outlet pipe is the embodiment of personality. Moreover, the sound quality and modification have broken through the limit of noise (90 dB). Although the requirements are different in different places, they have not exceeded the standard of 90 dB, but this noise is very dangerous for motorcycles. Loudspipesavelife is an American language (its loud exhaust can save lives). In more than 80% of motorcycle vehicle collision safety accidents, the vehicle is caused by carelessness. When our exhaust noise is loud, let the vehicle pay attention to the motorcycle and reduce the probability of safety accidents. This problem does not need to be debated. Many foreign motorcycle organizations are applying to the environmental protection department to modify the terms according to this investigation report. Although considering the relationship between the two neighbors, we may not talk about it for the time being. If the air outlet pipe is replaced, it is better to choose loud noise from the perspective of safety.