Cat-Back Aeroturbine exhaust kits are now available for the 2004. 5-2005 Dodge Cummins. These kits are easy to install and eliminate the restrictive factory muffler, sound great, reduce EGTs and and drone. The factory exhaust is cut at the Cat and muffler outlet and the kit bolts into place using a factory hanger and 4" clamps. The Aeroturbine is mounted directly on the outlet of the Cat with the off-set pipe and extension pipe connecting to the factory tail pipe. The off-set pipe that comes int he kit makes up for the elevation difference between the inlet and outlet of the factory muffler. You can see a picture of the kit here. http://www.dieselpowerproducts.com/exhaust2