If you have a Hi-Jack, you need one of these. The Hi-Jack no matter how you store it, rattles like crazy. This Daystar isolator is 10 times better than the Hi-Jack isolator. This is a very easy to install on you Hi-Jack, and will make your Jeep JL a much quieter place. It takes around 30 seconds to install. Best of all you can get it on Amazon for less than $14 bucks.