The onnly way they can possibly help is if you have a larger 12V+ wire going in than you do a 12V- wire coming out.
If you had a 1/0 cable going to your starter and grounded it with a 16ga wire, there would be a need for a larger ground. If you have a 4ga power and a 4ga ground, then there is no need.
Grounding kits are the dumbest thing since Canada.
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