T-304 stainless steel, TIG welding, limited service life guarantee, stainless steel mesh wrapped hole core and high-quality glass fiber packaging. If you only pursue the beauty and sound quality of the car, you can change the middle tail part or just change the tail drum. As long as you pay attention to the refitting back pressure of the car, it can not be too different from the original factory, but for the refitting of the car power, The modification effect of the exhaust head section will be greater than that of the tail drum, which needs to consider many aspects. There can be no big difference in choosing a good car.