Saccowboy,
We sell 36 inch, expanded on both ends, muffler delete pipes that are designed for the MBRP aftermarket systems. With a little back yard engineering you could make it work, we have them in aluminized and 409 stainless at a lot less than what you mentioned etc. The stock muffler is a low in high out design, so you'll have a pipe like ours at an angle when installed. We also have a replacement muffler that is designed for the 2004. 5+ trucks as it has a 4 inch inlet and outlet, your intermediate pipe is 3. 5 so if you're willing to get an adpator or just fill the void with weld it'll bolt right on too! It won't be at an angle as it's go the "S" pipe in it already etc to make up for the stock systems offset.
Mark @ DPPI