Gibson Performance 320000 Cat-Back Dual Split Exhaust SystemExhaust System Kit Cat Back Dual Split Exhaust System Cat Back Dual Split Exhaust System; Aluminized; 4x9x18in. Oval Body; 3in. Dual In 2. 5 in. Offset Outlet; 4 in. Polished Double Wall Slash Cut Tip; Exit Straight Out Back; SPECIFICATIONS: Exhaust Type: Dual Exit Position: Dual Split Rear Exit Style: Straight Inlet Inside Diameter: 2. 500 in. Material: Aluminized Muffler Body Length: 18. 000 in. Muffler Type: Chambered Outlet Outside Diameter: 2.