I believe at Speed Week density altitude was about 6200ft at one point a week ago. I know normal elevation is ~4200ft. My plan is an air damn to bring the front withing 1.5" of the ground, ducted venting where allowed, side skirts, and a pro stock style spoiler with the tallest endplates, and vertices I am allowed. Spoilers and vents, depending on what class, can help greatly, also can slow you down. It is about balance. Enough weight to have traction, enough downforce for traction and stability without too much drag, if air goes under the car, how to get it out and take advantage of it. There is always a tradeoff. Hp is king as long as you can out it to the ground with the lack of available traction.