The four doors double, back trunk, chassis, four-wheels and wings board, engine cover
Four doors: it forms a case body in the door board and helps the working efficiency of the horn and reduces the shock of the car door and the wind’s noise.
Back trunk: it reduces the noise of the road and the steel; reduce the shocking of the air.
Chassis: Foster the chassis and deduce the noise
Four- wheels and wings board: it is the most efficient way to reduce the noise from the wheel
Engine cover: it will separate parts of the noise from the engine and cut off the heat. Also it will prevent the aging of the engine cover and extend the working time
