search up "ground effects"
using front splitters rear diffusers and undercarrage tunnels iirc just look in old formula 1 history theres LOADS on it and how it works!

basic principle is to let as little air as possible through under the front bumper. keep the maximum amount of air under the car and not let it escape out the sideskirts. and directing the flow out from under the car, as high as possible (on the longest possible trajectory) into the flow of the air which is passing over the car. in the most efficient manner
thus creating downforce with little drag .