Flowmaster's American Thunder Axle-back exhaust system for the 2013-2014 Mustang Shelby GT500 with the 5.8L Supercharged V8 engine is perfect for the person looking for an aggressive exterior sound level while maintaining a tolerable interior sound with all of the performance benefits that you would expect from Flowmaster. This bolt on 409S Stainless Steel system features dual specially tuned resonator mufflers with quad 3.50 in. stainless tips that have machined aluminum edges. The exhaust system is manufactured in the USA and is covered by Flowmaster's Lifetime Limited Warranty. Designed for an easy fit, this system includes all necessary parts and hardware for installation.