Your 04 SHOULD have a 2 3/4" exhaust system on it from the factory. I don't know if they make a band style clamp that goes 2 3/4" to 3". I am assuming that you are purchasing a 3" inlet/outlet muffler for your rig. Flomaster, Magnaflo, and many other companies offer a 3" "cat-back" system for you application. With it, you just unbolt the tail pipe from the y-pipe beside the transmission on the passanger side of the trans. The kit will include a new pipe and muffler with all of the goodies to hang it and clamp it together. If you want a muffler only, you will most likely need to get a piece of pipe made to get you from the 2 3/4" stock pipe to 3" inlet of the muffler. Most exhaust shops have a machine that "stretch" the pipe to slip over the other. Hope this helps!