Those are bullshit and a waste of money. If you want a ground wire kit, here is what you do. Get some 4 gauge power wire, color of your choice, and some copper terminals. ( I will see if I can find a link to the correct terminals.) Start by replacing all of the engine's factory grounds with the wires that you build at the same length. Once that is done, then make a couple extras to add on in different areas from the engine and trans to the chassis. SunAutomobile out of Japan were the ones to innovate the ground wire upgrade and I have proven it to work on a number of vehicles, from my camry, several hondas, all they way up to grand am series porsche race cars. When you can upgrade your factory grounds with larger wiring and less resistance and then add a few more to it, you are gaining: smoother idle, slightly better gas milage, more horsepower, more torque and giving sensors and electronics more ability to perform to the max.
Forget the kit that you posted earlier, it won't work as well as building your own.
Here is a link to the terminals
http://cgi.ebay.com/Lot-of-Four-4-Ga...3286.m20.l1116