Thank you for viewing. Maximum effect is achieved with just one additional cable, without the need for complicated grounding. Improves sound quality of car audio Improves stability of electrical components Changes in torque feel, etc... We have received positive feedback from many people who have experienced these effects. Version 2 has been upgraded from Version 1. We have limited quantities of these rare, domestically produced items available. We have twisted three 4-gauge ground cables, which are standard equipment on domestic large sports cars, to equal a single 1/0 gauge cable. This combines the benefits of both 1/0 gauge and 4-gauge, enhancing both audio and driving performance. The disadvantage is that the wires are even thicker, making them more difficult to handle. There is a directionality, so a black mark is placed on the tip of the terminal. The current flows from the marked end to the unmarked end, but you may enjoy experimenting by switching them around to suit your preference. The terminals are crimped to fit M8 bolts, but we can also crimp them for M10 bolts if you allow us some time. Please be careful as disconnecting the battery terminal temporarily may reset your audio, navigation, and drive recorder. Please understand that this is done at your own risk.