I use to track the car at Laguna Seca back in the Dot Com days when there was more disposable income.
So I figured that if I'm going to install a spoiler on the car, it mine as well be justifiable with regards to forum following function, and lemme tell ya, it works.
I can start to feel the effects at 60MPH.
Toyota Supra's spoiler is rated at 60lbs of Downforce at 80MPH if I recall correctly from some factory literature years ago.
My spoiler has 4x the surface area and is adjustable for a greater angle.
I love the rooster tails it creates in the rain. Tall enough to get on the windshields of 18 wheelers....