Dustin-Have your alignment checked. There are some shops which will check it for nothing if the alignment is okay. I was lucky enough to find one. I would also check the bushing as Kyle mentioned. The problem with the bushings is its too close to the cat on the passenger's side. The heat from the cat usually causes them to fail. Why Ford put the cat so close to the bushing is beyond me. I'm on my second set. What I did though which I'm hoping will solve the problem is when I had my pipes and new cat installed, I had the shop move it back a bit. Hope this helps.
