The threaded portion of the flex joints are welded on at an angle on purpose. This means you're stuck with their joints, or you have to have some custom made if it ever needs to be replaced. I'm not totally crazy about it, but so far hasn't given me any problems. Some people have had exhaust clearance issues with the lower passenger side link. Mine cleared just fine. Also seen some complaints about removing the whole cross member to get the upper link out, few whacks to the floor with a hammer solves that issue real quick as needabow mentioned. I went with the rock link because it had the highest clearance arms and cross member that I've seen out of all the three links out there, I'm super happy with my purchase.