Adjustable rear springs?

Has anyone heard / tried the newest item to come from Wolfe Racecraft? It's a coil over of sorts for the rear end of the car. Great compliment to the front I think. Although it does require some hacking up of the car... i.e. Removing the factory upper spring perch and welding their adjustable one in it's place. The upper piece is threaded and has an adjoining adjuster on it which rotates and allows for quick raising/ lowering/ pre-loading the suspension.

Anyone used one yet? If so, how does it drive on the street?

:confused:
I didn't see it for our cars. They do have something similar for Mustangs, but it's mainly to use smaller diameter springs for a minitub.

I thinks it's a new item.. Just not sure how new exactly.

Basicly the opposite of a Ground Control adjuster, just mounts at the top and welds in.

Kyle