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Yeah basically the purpose of a diffuser is to decrease the pressure of the high pressure air running underneath your car to give it a smoother transition to the pocket of low pressure air directly behind your car. Similar idea to the vortex generators, they decrease air pressure to better contour to the back windshield or around a sharp corner or something.
Diffusers don't have to curve upwards but it probably helps a lot, that way they are diffusing air cross sectionally like I said before, not only left and right but up and downways also.
Basically, if you take that higher pressure air rushing under your car, and drop its pressure before you dump it out the back of the car, you will end up with less low pressure air behind your car, in other words, less drag.
Theoretically it works beautifully and I think they look frickin sweet too. But I am anxious to see if it makes a big difference or not.
Thanks guys.
John
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