Borla 12651 S-Type Cat-Back Exhaust System Fits 07-09 911Exhaust System Kit S Type Cat Back Exhaust System S Type Cat Back Exhaust System; Incl. Muffler Hardware 3. 15 in. Round Dual Rolled Angle Cut Tip; Dual Split Rear Exit; SPECIFICATIONS: Exhaust Type: Dual Exit Position: Dual Split Rear Exit Style: Straight Inlet Inside Diameter: N A Material: T 304 Stainless Steel Muffler Type: Straight Through Outlet Outside Diameter: N A System Type: Cat Back Tail Pipe Material: Stainless Steel Tip Diameter: 3. 150