Borla 140589BC Touring Cat-Back Exhaust System Fits 15-17 MustangExhaust System Kit Touring Cat Back Exhaust System Touring Cat Back Exhaust System; Black Chrome Tips; 2. 5 in.; Incl. Connecting Pipes Mufflers Hardware 4 in. Single Round Rolled Angle Cut Tips; Single Split Rear Exit; SPECIFICATIONS: Exit Position: Split Rear Exit Style: Straight Inlet Inside Diameter: 4. 000 in. Material: T 304 Stainless Steel Muffler Type: Turbo Outlet Outside Diameter: 4. 000 in. System Type: Cat Back Tail Pipe Diameter: 2. 500