Gibson Performance 619013 Cat-Back Dual Split Exhaust System Fits 15-17 MustangExhaust System Kit Cat Back Dual Split Exhaust System Cat Back Dual Split Exhaust System; Stainless; 3in. Tubing; 4x9x13in. Oval Body; 3in. Offset In Outlet; 4. 5in. Polished Round Slash Cut Tips; Exit Straight Back; SPECIFICATIONS: Exhaust Type: Dual Exit Position: Dual Split Rear Exit Style: Straight Inlet Inside Diameter: 3. 000 in. Material: 304 Stainless Steel Muffler Body Length: 13. 000 in. Muffler Type: Chambered Outlet Outside Diameter: 3.