The kit is not a bad idea but like stated you are not going to see any real performance gain.
Now if you have a big stereo you should get much crisper performance but IMO it is a Must to upgrade all the wiring when running much over stock. Also not just the grounding either but the positive feeds as well.
Headlight output could increase some as well with the better wiring. Provided of course the stock wiring for the lights is not holding you back to begin with.
