The MagnaFlow 5 X 11in. Oval Straight-Through Performance Exhaust Muffler 12909 is engineered to enhance your ride with a healthy helping of our signature exhaust sound and dyno-proven performance thanks to its free-flowing straight-through perforated stainless steel core wrapped in stainless steel mesh and acoustic fiber fill. The reversible universal 3.5/3.5in. diameter inlet/outlet Straight-Through layout allows you to install it in whatever orientation and configuration you see fit. However professional installation is highly recommended. Muffler 12909s weight-optimized 5x11x22in. oval-shaped body features a satin finish that elevates the overall aesthetics of your current exhaust setup. 12909 is made of durable corrosion resistant stainless steel and produced using cutting-edge CNC precision robotic manufacturing techniques all backed by MagnaFlow's limited lifetime construction warranty.