the "vanes" in the rear diffuser provide stability with the air which allows a more consistant low pressure area under the rear of the car, thus more downforce.
that kit is more for down force that smoother aerodynamics however just that center peice without the vanes could help a lot in smoothing out the air flow if it never excedes 11 degrees i believe. i dont remember, but the rear panels should not be steeper than a certain angle... someone want to chime in with that number?
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