[FTS]

As I was working on the car changing pads and so forth, I took a more detail look at the brake cooling. There are two cooling channels (or air guides) on each corner. At the front, the higher up channel is taking air from the inside front wheel fender opening, which is actually fed from the front radiator openings and probably the some of the excess air is routed there. If this is true, then there must be enough room for a 2-3" NACA duct from the side of the front radiators.

Very similar arrangement in the rear as well. There is an opening at the bottom towards 2/3rd from the middle that channels additional air into the rear rotors, in addition to the plastic air guides mounted in front of the rear tires. I am sure a at least 2" NACA duct would fit in there easily, but since the air guide is routed fairly efficiently from the looks of it, I am not sure how much more improvement a NACA duct would make there.