The main purpose of fender vents and side vents is to relieve built-up air pressure from inside the wheel arches which can causes aerodynamic lift. This air gets trapped in the wheel arches and creates high pressure resulting in lift over the front wheels reducing traction. Relieving this built up high-pressure system in the wheel arches reduces front axle lift thus increasing safety. Plus by releasing Trapped air in the wheel arches reduces aerodynamic drag.
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