The modification of body appearance has always occupied a very important position, and the fastest and easiest way to change the body appearance is to install aerodynamic suite. The so-called aerodynamic kit is commonly known as the big bag, which basically includes the air intake grille, side spoiler (side skirt), rear wall and rear spoiler (tail wing) and so on. Sometimes we will see that a lower spoiler is added to the original bumper, which is generally called chin: if the front and rear safety bars are not replaced, only the chin is added, and some people call it a small bag. Adding aerodynamic kit can not only make the vehicle more visible and sporty, but also have a good performance improvement effect. Installing the aerodynamic package will not make the vehicle run faster. Strictly speaking, a good kit usually reduces the speed and makes the vehicle have more stable performance.