you don't really gain any power from those, some day you do. it just helps relieve lost current. it does get rid of the shock a lot of cavalier and sunfire owners have when getting out of the car. you know what i am talking about. you get out of the seat and shock yourself on the door or side of the car? yea that will go away.
I was a retard, and now I'm permanently banned.
i have a ground kit from static x motorsports. its much cheaper than the one u posted. go to the gp forum and look for "3rd gen grounding kits". i also have the hyper voltage system but have yet to install it yet b/c the connectors on the wires are to small to fit over the battery bolts. as soon as i fix this ill install it an let u know how it is.
T.