Borla 140707 S-Type Cat-Back Exhaust System Fits 09-14 ChallengerExhaust System Kit S Type Cat Back Exhaust System S Type Cat Back Exhaust System; Dual 2. 5 in.; Incl. X Pipe Connector Pipes Intermediate Pipes Mid Rear Mufflers Dual 4 x 2. 5 in. Rectangle Angle Cut; Dual Split Rear Exit; SPECIFICATIONS: Exit Position: Dual Split Rear Inlet Inside Diameter: 2. 500 in. Material: T 304 Stainless Steel Muffler Type: Straight Through Tail Pipe Diameter: 2. 500 in. Tail Pipe Material: Stainless Steel Tip Diameter: 4. 000