I have the K springs and no its not needed, and I didnt use one. But if you want the rear to be correctly centered like it was oem, then yes you need one. Mine is visually off to the drivers side. And its noticeable. If you get a panhard bar, you need to make sure the adjuster is in the middle of the bar, skip the bar with the rod ends. The passenger side rod end is boxed in by the mount, and its virtually impossible to properly tighten it after its adjusted. I forget which brand one has the solid end mounts and has the adjuster in the middle of the bar, but thats the one you want. Trust me you will be smacking yourself if you get the other one. While you are at it, you might as well do the lower control arms too. Again, no relocation brackets needed. But if you get those too then they need to be welded on NO QUESTIONS. I have seen them shear off bolts at the track because they were not welded on along with being bolted.
Get this type....
NOT this one....
nice! good info man thnx