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An air dam's main benefit is downforce, with some aero benefits from lower air speed on the undercarriage roughness, despite the increase in frontal area. For economy, you want a smooth underside, and a fairly low, rounded front end to give as much underflow as the space will allow. A small air intake that adjusts in size, with smooth ducting sealed to the rad is another great improvement you can make at the same time. Take care about how the air flows back out, too.
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