I just made my own Ground wire system with some 8 gauge power wire I had lying around and some connectors I bought on ebay (100 8gauge for 12-13 bucks). I know alot of you are all skeptical of them thinking that they don't do a thing. And for the most part I didn't feel any difference. The main thing it did though is smooth out my idle along with the engine just seems to run better. I grounded only about 6 spots at the moment, one because I was skeptical that it would do anything at all, and two I didn't have enough wire to do much else after using most of the 14ft I had to test it out on my friends civic.
My truck before the system had a bouncy idle when sitting in one spot. The truck now has a more solid idle, seems to be a little bit smoother running, I'd almost say a bit more responsive. The bouncing idle is the only reason why I did this mod the other stuff is just extra. Overall I would recommend this mod if your looking for something cheap to do. Kept me busy for a couple of days, One to measure the wires out and crimp and solder the connectors (I had other stuff to do that day and it was cold), the other day to put it on.
Cost:
8awg Wire = 0$ had
100 8gauge connectors= 12-13$
(Ebay)
(at the moment I only used 12 of them on my system)