The ball joints on my 14 year old Mustang GT have given up. I need replacements quickly since I am running the Roval in Charlotte in four days. I believe the minimum upgrade is the GT500 arms. As I understand it, the GT500 arms come with nylon bushings instead of rubber. Edit: stamped arms are stiffer as well. Second step up is the Steeda arms with extended ball joints. These appear to be the GT500 arms with swapped out ball joints. My car is lowered ~1.5" with coilovers, and, as I understand it, the extended ball joints correct the roll centers. I'm not sure what effect this will have on the alignment, but I have Max MoSport C/C plates, so I assume I can get things back where I want them. The next step I see is fabricated arms from BMR. More money, but are they worth it? Would you suggest going "adjustable" to get the heim joint? I think I'm going to stop one short of this one to lower my maintenance burden and preserve NVH. I think I just talked myself into the Steeda arms, so time to call to see how quickly I can get them. Comments are still appreciated, because my work here is never done.