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Originally Posted by jtbo
It is insane, that is why I can't believe that, not with just one tank.
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Stll, it's what you recorded
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I had lower airdam section at front of tires but there was less than inch of clearance and that was bit problematic with our rough roads, even this 2 inches (50mm) is scraping,
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Don't make the air dam too low, it increases frontal area, and thus drag.
You could lose the aerodynamic improvement to the increased area.
As low as the lowest major car parts is OK.
Going deeper only adds extra area.
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I would like to install air guide on hood, to reduce wind noise,
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Are you sure it comes from the hood area ?
Wind noise is mainly due to A-pillar and mirrors, or wipers, if they are largely exposed.