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The question was "curved or straight".
The answer mostly is: what do you have to attach it to? If you are extending something that's already there, go with that contour, whatever it may be.
Curved ends probably are better, but by a detectable amount???
I'll tell you what a perfectly straight air dam has going for it: when it hits something (and it will) it can "hinge" back then recover with little more than scratches vs curved air dams mangle or break when they hit something. Also, the straight one can be lower to the ground while maintaining a desired approach angle vs a curved one by virtue of being able to be closer to the front axle line.
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