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Originally Posted by hyperzulu
The back of the stock cars don't really have a diffuser. I think we just use that term for lack of better word. The optional M-Performance piece is a real diffuser and to my knowledge, BMW does wind tunnel testing, so it's a functional piece. It actually is designed to reduce drag, but few will notice the difference, I'm sure.
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Even that M-Performance piece is a bit of marketing magic. Rear valance diffusers only create meaningful downforce when they're paired up with a closed-off underbody tray with a car that's nearly slammed to the ground.
They can claim that there are aero impacts, but it's nothing to practical effect.