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downforce?? Looking at the design, it doesn't seem to force the car down...
It is a visual mod.....But if the air travels over the Splitter and onto the lip of the bumper it will give the front a little more downforce, I am not a physics guru but it makes sense....
Maybe Cheston can jump in on this, he is a big aerodynamics guy...
There is a bunch of aerodynamics things the Z has that some of people have no clue why its there, but it all has small effects on the overall dragcoefficient or aerodynamics to make the car perform better.