Maintain Traction:Rear spoiler pushes the back of the vehicle down, so the tires can grip the road better and increase stability.
Reduce Weight:
Reduce the weight of the vehicle by using Lightweight materials, prevent unsteady high speed driving.

Increase Fuel Efficiency:
By pushing the air around the vehicle to lower the amount of the vehicle needs to burn to propel itself forward.
Create The Stylish Look:
As a fashion accessory, spoiler perfect the streamline appearance of the car.