Gibson Performance 312601 Cat-Back Dual Extreme Exhaust Fits 07-08 H2Exhaust System Kit Cat Back Dual Extreme Exhaust Cat Back Dual Extreme Exhaust; Aluminized; 2. 25in. Tubing; 4x9x18in. Oval Body; 2. 25 in. Dual In 3. 5 in. Center Outlet; 4in. Polished Slash Cut Tip; Exit Behind Each Tire; SPECIFICATIONS: Exhaust Type: Dual Exit Position: Rear Side Exit Style: Straight Inlet Inside Diameter: 2. 250 in. Material: Aluminized Muffler Body Length: 18. 000 in. Muffler Type: Chambered Outlet Outside Diameter: 2. 250 in.