Flo-Pro has done quite a few things for the exhaust system market. Featuring 4" aluminized pipe, and mandrel bent tubing. This exhaust system is literally a "bolt-on" solution. Gain performance and sound with Flo-pro products. Save some money by doing it yourself in your driveway, or give us a call to setup an appointment and we can install it for you. We have installed several of these systems on various year trucks and have been pleased with the results. Match this up with a performance cold air kit and a custom tune to give new life to your 2003-2004 5.9L engine.