For the person who wants the aggressive look of a NASCAR race truck along with all the benefits that a Flowmaster Cat-back exhaust system provides. D.O.S.S. (Dual out same side) systems are the perfect choice. American Thunder systems deliver a moderate to aggressive interior and exterior tone and are suited to the enthusiast who wants their performance to be heard. 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 Aluminized Tubing 3 Year Limited Warranty Moderate to Aggressive Exterior Exhaust Tone Includes Hangers and Hardware For Easy Installation Connects After Factory Catalytic Converter Dual Out Same Side Exit Dyno Tuned for Maximum PerformanceProduct Description: '99-'04 Ford Truck, Lightning, 5.4L Supercharged, 2/4 Wheel Drive, 2.50" Outlets, 50 Series H.D. Muffler, 4.00" Logo Embossed Stainless Tips w/OEM Style Exit, American Thunder Muscle Truck, DOSS, Mandrel Bent Tubing,16 Gauge Aluminized SteelPit Stop USA offers Flowmaster American Thunder Muscle Truck Single Exhaust System - 1999-2004 Ford Lightning 5.4L Supercharged 17367 at low everyday prices. Be sure to check out all our products from Flowmaster including Flowmaster Ford Truck / SUV Exhaust Systems.