Here's a pic of my setup. 4 gauge from KnuKonceptz, and the only battery terminals I had at the time. I used a small battery because I did not want to drop the gas tank in order to bolt down the tray, and because I have very little power needs except for starting the car and running the engine.
The cable runs directly to the starter, then an 8 gauge for main power has been daisy-chained and run to the relays. I cut the old ground cable in the engine bay off, so there is only the cable that runs from the lower intake manifold to the battery tray.
