There's a lot of people that think an air bag 4 link is the same as a drag racing 4 link, I see that often across the internet. Several years back I was reading "Door Slamers, the ch***is book" and there was such a flood of information about 4 links it was kinda overwhelming. I decided I'll just stick with my ladder bar for what I'm doing, you'd almost need your own set of scales to really dial in a 4 link.