<P> Often, these devices are designed to be highly adjustable to suit the needs of racing on a given track or to suit the talents of a particular driver, with the overall goal of reaching faster times . </P> <P> The goal of many spoilers used in passenger vehicles is to reduce drag and increase fuel efficiency . Passenger vehicles can be equipped with front and rear spoilers . Front spoilers, found beneath the bumper, are mainly used to decrease the amount of air going underneath the vehicle to reduce the drag coefficient and lift . </P> <P> Sports cars are most commonly seen with front and rear spoilers . Even though these vehicles typically have a more rigid chassis and a stiffer suspension to aid in high speed maneuverability, a spoiler can still be beneficial . This is because many vehicles have a fairly steep downward angle going from the rear edge of the roof down to the trunk or tail of the car which may cause air flow separation . The flow of air becomes turbulent and a low - pressure zone is created, increasing drag and instability (see Bernoulli effect). Adding a rear spoiler could be considered to make the air "see" a longer, gentler slope from the roof to the spoiler, which helps to delay flow separation and the higher pressure in front of the spoiler can help reduce the lift on the car by creating downforce . This may reduce drag in certain instances and will generally increase high speed stability due to the reduced rear lift . </P> <P> Due to their association with racing, spoilers are often viewed as "sporty" by consumers . However, "the spoilers that feature on more upmarket models rarely provide further aerodynamic benefit ." </P>

What does a rear spoiler do for your car
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