Well, if you really insist, from a member on FA:
Aero_Deck wrote:I do not think they are worth it IMO. All you need to do if you have an older car like a B13 that could benefit from a better ground is use one of those braided Taylor ground wires you can get from Summit Racing. I have the Sun Auto kit on my B13 and I cannot say that I noticed a difference. I do believe that they do not work well with lightweight drycell batteries. I installed a Hawker Genesis 10lb battery before the ground wires and it never gave me any problems, then after the ground wires, my battery would drain consistently. So, I disconnected the two ground wires I had going to the battery - terminal and have not had any problems since. I kept the others that pigtail around the engine intact though.
He has the Sun Auto kit, which is basically about as high quality as you can get.
And if you really want to know what the real quality kit does, you are going to have to spend $80 doing a before and after dyno - that's the only true way to know if it helped aside from the butt dyno/psychological factor.