anyone know any of the specifics about this wing, as far as amount of downforce, if any, and at what speed, it produces? is it adjustable?

I need to put something on the rear of my car as I experianced some wheelspin at 145+ mph and it was a little scary to think of. plus I'm sure it would help getting off some of the high speed sweepers I run.
I know its going to get some ricer comments but I need it and everyone else is starting to show up w/ wings and aero stuff, so I feel like I am starting to be at a dissadvantage. I heard one guy saying he paid like $1,200 for his wing and I aint willing to pay that much.