Magnaflow Performance Stainless Steel systems are our premium line featuring a POLISHED 100% stainless steel muffler and mandrel-bent stainless steel tubing with a DOUBLE WALL tip. Magnaflow Performance Diesel Exhaust comes with a Lifetime Warranty, Dyno Tested And Proven To Make Power, Performance Gains In Horsepower And Torque, Great Sound -Has A Smooth, Deep Tone, Easy To Install, Mandrel-Bent. All Welded. Built To Last