grounding only help to improve the electrical flow and making the firing (spark plugs) become more efficient. other than take, im not sure...
for what i know, if you're not involved in ICE (where it required more power and better flow of the electric), then install or without install, doesnt make any much different.
anyway, is my opinion only... dont take it too serious :D
my post on above it just showing that brothers is selling it. they does have the sample/display on the grounding fitted on the engine for you to view. if you are unclear what is it, then go to brothers and see it. just see it only.. dont need to buy :D