A motor vehicle when it was formed must meet eligibility standards, both in terms of engine, the legs until the aerodynamic element. Especially when the car will be in designing the shape and size, the aerodynamic elements of the car body is of considerable concern. So the car can drive at high speeds without having shaky or out of control, especially when cornering required precise calculation, it is also necessary to test the aerodynamics of the car before the car could be mass produced and then disseminated.Often we see a car that was modified by adding a rear spoiler, aerodynamic custom car spoiler mounted on the back of this car has an important function, namely as a counterweight as well as ballast at the time of fast moving cars. When driving at high speed, a car will be indirectly lifted off the ground because of high air pressure, to avoid the car to rise up and become loose kendalilah this spoiler in pairs. Spoiler is not heavy so it does not have a significant influence when the car in normal speed. The workings of this spoiler is to utilize the wind pressure will suppress the body behind a car down so the car is not lifted when fast moving.In addition to looking outside the car modification, it should be noted also aerodynamic car engines, in general, every car has the engine front section, so keep in mind the harmony and balance of a machine that will be installed. With advances in technology as it is now a car now have the same sophisticated machine with a new computer that can adjust to road conditions in its path.Especially if the car was used to racing in particular is designed to drive with extra high speed, if the aerodynamic race car is not considered impossible can go fast and be in the forefront. In this type of car, aerodynamic element is one of the main priorities that became decisive victory. Because it forms and modifications in the race car aerodynamics is arguably produce nearly perfect.