New Delhi: Spoilers can affect the speed and performance of a car in several ways. Firstly, a properly designed spoiler can reduce aerodynamic lift and increase downforce on the rear wheels, improving traction and stability at high speeds. This enhanced grip allows for better handling and cornering capabilities.

However, spoilers also create additional drag, which can negatively impact the car's top speed and fuel efficiency. Drag is the resistance encountered by a moving object in a fluid (in this case, air). 

Spoilers disrupt the smooth airflow around the car, creating turbulence and increasing drag. This additional drag force requires more power from the engine to overcome, resulting in reduced speed and increased fuel consumption.

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It's important to note that the impact of a spoiler on speed and performance depends on various factors, including the design of the car, the specific spoiler design, the driving conditions, and the intended purpose of the vehicle. 

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Spoilers are typically more beneficial for high-performance or racing cars where stability and grip are crucial, but they may have less noticeable effects on regular passenger vehicles.

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In summary, spoilers can improve a car's stability and handling by increasing downforce but can also increase drag, leading to decreased top speed and fuel efficiency. 

The overall impact on speed and performance will vary depending on the specific design and usage of the car.