Aftermarket Exhausts Systems are one of the most popular upgrades for any 2020-2023 Chevy/GMC 6.6L L5P 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. Exhaust installation is normally a do-it-yourself project that can be completed in your driveway. You can find exhaust systems from all of the leading brands like MBRP, Magnaflow, AFE, Banks Power, AP Emission Technologies, and more!