Gibson Performance 619017 Cat-Back Dual Exhaust System Fits 18-23 MustangExhaust System Kit Cat Back Dual Exhaust System Cat Back Dual Exhaust System; Stainless; 3 in. Tubing; 4x9x14 in. Oval Body; 4 in. Polished Slash Cut Tip; Exit Straight Out Back; SPECIFICATIONS: Exhaust Type: Cat Back Exit Position: Straight Out Back Material: T304 Stainless Steel Tip Diameter: 4. 000 in. Tubing Diameter: 3. 000 in. WARNING CA Proposition 65: Yes WARNING CA Proposition 65 Message: WARNING: Motor vehicles contain fuel; oils and fluids;