I own a 2002 2500 HD Crew Cab Duramax Diesel w/ the ALLISON Transmission. I have a little over 50000 miles on it, and it has been a great truck, no problems at all. I am looking for a company or a manufacturer that makes a custom pipe to go in place of the muffler. Many manufacturers have these kits for the Dodge's and Ford's. I have yet to find one for my truck. Can anyone help. I'm not in the market to buy a new exhaust system due to lack of financial funds, if you know what I mean.