The MagnaFlow 4in. Round Straight-Through Performance Exhaust Muffler 14156 is engineered to enhance your vehicle with 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 weight-optimized, reversible, universal 2.5/2.5in. diameter inlet/outlet layout and 4x4x6in. round body shape offer flexible installation options to fit the spacing requirements of your ride. Professional installation is highly recommended. 14156 features a premium brushed finish. Muffler 14156 is made of durable, corrosion resistant stainless steel and produced using advanced CNC precision robotic manufacturing techniques, all backed by MagnaFlow's limited lifetime warranty.