These are a nice look, but impractical for inclined driveways or steep speed bumps. At 100mph my e9 (no aerodynamics) was very stable, but at 135mph it was very light in the front end and although the car could go faster I wouldn’t (even in my middle-aged youth 30 years ago). So you must ask yourself, do you want to drive your car REALLY fast, or just look like you can?