Assuming the rules allow for it is there any advantage in extending the diffuser beyond the rear bumper? My initial thought was "the bigger the better" but I am now thinking that is not the case. My second question is about the diffuser exit. Almost all diffusers for sale for street cars (that are likely mostly for looks) have a rounded exit like the first picture below. Race cars however all seem to have virtually no upward curve at the rear of the diffuser, F1 being the easiest to see but I know ALMS cars are the same way. Based on that alone I am inclined not to have any upward curve in the diffuser. Any help in my design would be greatly appreciated, I have the rest of the car well sorted but have little to no aerodynamic experience and much of the subject is counter intuitive.
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