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Thanks, and after looking at your other thread, your undertray looks great, but I would significantly lower the angle of the rear diffuser. In fact, you don't want a "diffuser" at all. Diffusers create a greater low-pressure area by "diffusing" a given amount of air molecules over a greater volume of space. What you want is a smooth surface that reduces wake profile while keeping attached flow, and 25 degrees is too much to keep attached flow on top of the car, in open air, let alone underneath, where the air is trapped between the ground and underbody. You can search the forum for lengthy discussions on what is optimal, but I would stay around 10 degrees.
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