I myself doubt that this item will do any of the claims I've seen across all the manufacturers. That said, I am currently in the process of making my own. I work around electrical components for my job and sourcing what it takes to build one was fairly easy for me. On top of that I believe mine is going to be better built simply because I'm doing it and it's for my car so I'd take more care to make it look nice than a big supplier would.
There is no such thing as "too much" grounding in any electrical power system. Only application I've seen exception to this rule is in some telecommunications applications.
I'd think that with very little research a person could build one of these in an hour and spend no more than $35-40 on it. For that money even if it does absolutely nothing if done right it will make the engine bay at least look nice, any power gains would be a bonus imo.
I'll post pics of mine when I get done with it.
Last edited by Bauran; 10-10-2013 at 10:42 AM.
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