Adjustable Panhard bar depends on your car. I needed one because my rear end was not centered due to lowering. But every car is different. Some may need and some may not. A square setup will help in the understeer department, and most stock mustangs are square to begin with. Usually the staggered set up has wider tires in the rear for more traction, for increased horsepower. And it does look cool. But its not pocket friendly vs a square setup. It also makes a difference on the heights of your tires you want to run. I never run shorter rear tires than the front tires, and it limits the number or tires you can run. The MM camber plates is just my personal preference, there are talked about in the forums. They are well liked. Here is what I just took off my car, as I will be going to much heavier rear springs.Square setup. I don't think I'm putting down the power to warrant a staggered setup. Nice to hear your opinion of K Springs, I was thinking about those. I'm still thinking hard about relocation brackets/adj panhard/steeda upper strut mounts with the springs as a start.
I'm still on the fence about the benefits of running a coilover on a DD street car. Will I really get the use out of it to warrant that kind of cash?