What do you mean by one 'half' made up?
You don't use an off the shelf kit?
Me too. Any diference between the kits? I googled and found at least
two so far:
HKS 'Circle Earth' Grounding Kit for $125 on fastwrx.com
and Hot Earth Hyper Grounding System for $135 on seffects.com
Paying that kind of money for someone's "grounding kit" is a huge
waste. You can easily do this yourself for far less with wire and
connectors obtained at Radio Shack and/or Home Depot. You don't need a
gazillion wires running all over the engine either, if it's going to
make any difference just a couple of wires to key points is all you
need. Most important is battery negative to intake manifold, and also
to frame.
On a new or relatively new vehicle where everything is still clean and
hasn't corroded there may be little benefit to doing this. One thing
you can do initially which is free, is to clean up the existing
grounds that are already there. Sometimes this is all that is needed.
On those that are attached to painted surfaces, you can check to see
that the paint is removed under the bolt/washer so it makes good
contact, sometimes the factory doesn't do this. Scrape off the paint
directly under the contact area, then put the bolt/washer back. Cover
them, and the immediate area around them, with some light grease or
touch-up paint to prevent corrosion.