Cat-back System 409S- Dual Rear/Side Exit - American Thunder® - Moderate Sound For 2004 to 2008 Ford F-150 and Lincoln Mark LT truck with a 4.6L or 5.4L engine, fits 2 and 4 wheel drive models and all wheelbases. 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. Features: Mandrel bent 16 gauge 409 stainless tubing Moderate exterior exhaust tone Includes hangers and hardware for easy installation Dyno tuned for maximum performance Premium Flowmaster qualityPit Stop USA offers Flowmaster Cat-back System 409S - Dual Rear/Side Exit-AmeriCan Thunder® - Moderate Sound 817417 at low everyda prices. Be sure to check out all of our products from Flowmaster including Flowmaster Ford Truck / SUV Exhaust Systems.