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Diffusers and under body panels are cool because they're one of the few mods/designs that can simultaneously reduce lift (or create down force) and reduce drag. By giving the air under the car a clean path and smooth exit, the pressure differential caused by the shape of the car can be reduced. Depending on the car, it could be negative. Not likely with the bubbly roof line of our cars.
Overall these cars are pretty solid aerodynamically compared to many others, but the traditional coupe shape isn't as inherently down force friendly as something like a McLaren 12C or other wedge like supercar.
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