[RedDevil]

I'm confused about the wheel fairings/spoilers on the car in the upper picture.
They are tapered along a straight center line, which would be great if there were nothing else around there.

But then there is the car body, pushing the air aside at the front and pulling it back in at the back. Imho the center line should follow the direction of air flow, or even slightly more slanted than that to help push away or draw in the air.
So I would think the fairings ahead of the front wheels should need strong 'toe in', and on the rear wheels some 'toe out' would be beneficial.
By directing the air under the tail that could rise slightly steeper, allowing for a shorter and lighter tail with no added drag.

I also wonder why they are that long. The wing profiles in the second picture suggest that causes unnecessary drag.

I'd shape them like this:

Excuse me for my poor drawing skills - just wanted to show my idea.

Said the aero layman... sorry if I have missed the obvious.