A few more notes...
Install went fine with the necessary extension pipes. New pieces came directly from Kooks, see the pics on the post. Part number is there as well. They didn't give me the hardware but I had purchased stuff from Home Depot that worked fine. For my complete kit, I had the two mufflers, two straight extensions (new pieces), two more extensions (these have a bend in them and one has a hanger), two resonator pipes (these bolt to each other, one has a hanger), and the necessary clamps (4 sets of two). Total of 8 sections of exhaust pipe.
The only issue I had was getting it all seated, it was just a little extended when I went to put the stock tail pipes back on. I had to loosen all clamps, and use a rubber mallet to get it forward enough. Worked fine. I also dropped the spare tire to do this. That helped more when I was removing the stock exhaust. If you have age or mileage on the truck, You are going to need the room to get those tail pipe sections off. And I spent a little time reapplying a coat of Amsoil HDMP to some of the metal under there. Next year I am going to Por15 the rear axle. I hate Ford allows these pieces to just rust.