The MagnaFlow 4 X 9in Oval StraightThrough Performance Exhaust Muffler 11379 is engineered to enhance your ride with a healthy helping of our signature exhaust sound and dynoproven performance thanks to its freeflowing straightthrough perforated stainless steel core wrapped in stainless steel mesh and acoustic fiber fill The reversible universal 25/25in diameter inlet/outlet StraightThrough layout allows you to install it in whatever orientation and configuration you see fit However professional installation is highly recommended Muffler 11379s weightoptimized 4x9x11in ovalshaped body features a satin finish that elevates the overall aesthetics of your current exhaust setup 11379 is made of durable corrosion resistant stainless steel and produced using cuttingedge CNC precision robotic manufacturing techniques all backed by MagnaFlows limited lifetime construction warranty