You can make your own kit for a lot less then buying a prefabbed one. All you need to do is go to a good car audio store and but a few feet of at least 4gauge power cable, as well as new battery clamps and a body grounding unit. You need to go bigger on the battery to body ground as well as the alternator to battery. Here are a few pics of my install with the stock battery.Total investment including Stinger competition grade cables and gold plated Stinger clamps and grounding unit was less than $100.




And here is one with the new Stinger SP1000 audio battery