I’ve spent a lot of money at that Speed Zone in Dallas. It’s along I-35E at the Walnut Hill exit.
Those things are some kind of fun. The finish line comes up fast and the wall is close. Thankfully the automatic braking system hauls you down quickly.
Hint; make sure your belts are tight before you run. The braking system is supposedly simulating a parachute stop. The negative G-force was higher than I expected the first time I made a run. I moved more than I liked on that first stop.
Atlanta used to have one of these. Stopped in while on a business trip years ago. I remember there being a line on the course where you had to hit a shift point. The closer to perfect you hit it the better the run