[Cd]

How is your project coming along ?
Since you are more into speed than economy, you may get up to speeds where an airbrake could do some good on the track.
Not only will it save your brakes and keep them from overheating, but it will also be something different from other cars. ( But functional ! )

I would imagine you are familiar with airbrakes, and I'd love to see what you would come up with.

( My first thoughts would be to have a "drag wing" type of flat spoiler on the back of the car.
Angled downward, it would decrease your wake and reduce drag, making the car faster.
As you apply the brake, the electrical signal that triggers your brake lights could also trigger the spoiler to flip up on a hinge and then act as the airbrake, with the release of the brake sending it back down again.
It would create loads of downforce too. Imagine little spoilers on all four corners near the wheels that are angled with the wind for less drag, but flip down when you tap the brake for more grip )

I really like the angular but smooth look you are going for.