Features and Benefits: 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. Material: 100% Stainless Steel Tubing O.D. Size: 2.5in. TIP O.D. Size: 4in. TIP Quantity: 2 Single/Dual: Dual Exit Position: Split Rear