Don't jump on things just because they are claimed to be so. Like ground wires, they do nothing but give you more bling bling. Plus its JDM so thats probably why its selling at just a tad below $100.
Understand your electrical system on the car first to see if you need it or not. Most likely not. If you ever some to a point where you need such a thing to give you more electrical power, just get a stronger alternator and a more powerful battery.
But it'll never give you the so called claimed benifits:
- -Increased torque
-Increased throttle response
-Brighter headlights/less dimming
-Reduced audio noise
-Increased fuel mileage
-Longer battery life
Oh no wait, maybe brighter lights, or better yet, lights just won't dim as much when other power source is used. And if you want to increase gas mileage, don't get on the throttle so much.