We really don't know everything the "Pro's" are doing or testing. It's a black cover over the slipper. When they are ready they will let us know.

For now there is a guy in his basement making a possible solution. Good for him! I bought one, because I wanted to know if its a good fix for the issue's that I am having with the performance of the truck. It is not a problem for all tracks and depends on the surface, track layout, equipment you are running but I will have it when I need it. I will have more than the cost of this part in springs, pistons, and tires to tune this truck at the track.