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"Bad Info: Spoilers and Vortex Generators Reduce Drag
Every time I hear this, I gnash my teeth. While there are a very few instances where this works, it is much more likely that spoilers and vortex generators increase drag. Forcing the air around stuff–like a spoiler–takes energy and therefore creates drag. This is a guarantee locally, but it may reduce drag effects elsewhere, providing a net drag reduction on the car. Remember, the entire car operates as a system."
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