Aftermarket Exhaust Systems are a popular addition to any 2001-2004 Chevy/GMC 6.6L LB7 Duramax. A performance exhaust kit will typically add horsepower/torque, decrease the exhaust gas temperatures (EGT's), and can even help engine efficiency. Different diameter exhausts are available such as 4" & 5" and offer unique sounds for your vehicle. When you start shopping for an exhaust you will notice multiple construction options and price ranges. Many manufacturers offer exhaust systems constructed in either aluminized steel or stainless steel. Installation is typically a straight forward installation and can be completed in your driveway with simple hand tools. All of the top manufacturers, including MBRP, Magnaflow, AFE, Banks Power, AP Emission Technologies, and more, are available today!