[Tcoat]

Originally Posted by Dzmitry

But it is interesting, because the lip is literally tiny as hell. Maybe 1-2 inches out past the connection points? I'm just basing that off of a picture of one. The car is quite high up off the ground as well and based on OPs photo, he looks to be at stock ride height. If he were to scrape the ground due to a slope or something going at such speeds, That would only be a scrape from the bottom. But as many mentioned, it has to be something that caught it and ripped it down under. OP states he has no screws/bolts/whatever left aside from one. And as far as I understand, sounds like OP endured no damage whatsoever to the bumper. So it had to be the cleanest hit ever to catch the half inch of lip that pokes out, rip it clean off with all the hardware, and have no effect on the bumper at all.

Might be harder to see from my photo, but my bumper did endure some damage even though the object barely caught my lip. In fact, it tried to pull the whole bottom portion down, and you can see the bottom grille popped out of its clips. The bumper also endured solid scrapes and paint fully rubbed off near the connection points of the lip.

Ya the thinness of it is what makes it hard for me to believe that there was enough air pressure to just rip it off. Unless he hit mach 1 of course.
If there was a picture of the remains it may be more clear what happened but my guess is that anybody going that fast isn't going to bother to go back and clean up their mess.