Quote:
Originally Posted by PAFirefighter11
Bumping an old thread.. what about this though? 
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It's the 'look.'
If you're a B-Spec racer and you actually do track time,where down-force can reduce orbits on the course,well then you'd see a benefit.
For fuel economy the lowest drag diffuser is at a 2.5-degree up sweep.Nothing steeper.It's not sexy but it's good science.