2.5in. Axle-Back; Dual Rear Exit with Single 4.0in. Polished Pro-Series Tips Exhaust Type Dual Exit Position Dual Rear Exit Style Straight Inlet Size (in.) 2.5 Material Stainless Steel Outlet Size (in.) 4 System Type Axle Back Tip Size 4.0 in. Muffler Type Chambered Inlet Inside Diameter (in.) 2.5 Outlet Outside Diameter (in.) 4 Tail Pipe Material Stainless Steel Tubing Diameter 2.50 in. Tip Size 4.0in Outlet Outside Diameter 4