I ran the positive cable right to the starter and I ran the ground right to the chassis, but if you do, you have to run an equal sized cable from the chassis to the block for a ground. I have the yellow optima in my drag car. I have it in Moroso box with a vent tube going out thru the trunk floor. You can't be to careful with hydrogen gas. I have seen many battery explosions and they are not for the faint at heart. I used 2/0 welding cable for the cable.
Chuck
