2015 - 2017 Mustang GT 5.0L Mach Cat Back Exhaust System 2015 - 2017 Ford Mustang GT 3" Dual Mach XV Cat Back Exhaust. Great Deep Aggressive sound our 18" mach X muffler is refined performance. Our innovative J-Pipe technology combats drone, Easy Bolt on design, Will work on both coupe and convertible Does not effect factory bracing or void any warranties. Invest now enjoy for longer. Free Tee shirt with every order. Sm, Med, Lg, XL , 2XL & 3XL available. PM us your size when you order or we will include an XL.