For the person who is looking for a complete Cat-back dual exhaust system with a moderate to aggressive tone. With easy fit in mind, these systems are mandrel bent for maximum performance and include specially selected mufflers. American Thunder systems deliver a moderate to aggressive interior and exterior sound level, and are suited to customers looking for efficiency improvements with a sound that will let people know you're coming. Like all Flowmaster systems, the benefits include improved throttle response, power and mileage. Designed for an easy fit, these systems include all necessary parts and hardware for easy installation.