Gibson Performance 316611 Cat-Back Single Exhaust System Fits 14-24 2500 3500Exhaust System Kit Cat Back Single Exhaust System Cat Back Single Exhaust System; Aluminized; 3. 5in. Tubing; 8x11x24 in. Oval Body; 3. 5in. Offset In Out; L 12in.; 4in. Polished Stainless Round Rolled Tip; Exit Behind Rear Tire; SPECIFICATIONS: Exhaust Type: Single Exit Position: Rear Exit Style: Straight Inlet Inside Diameter: 3. 500 in. Material: Aluminized Steel Muffler Body Length: 24. 000 in. Muffler Type: Chambered Outlet Outside Diameter: 3.