For the person who wants a subtle custom appearance with all the benefits that a Flowmaster Cat-back exhaust system provides. S.O.S. (Single out 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 Aggressive And Powerful Exterior Exhaust Tone Includes Hangers and Hardware For Easy Installation Connects After Factory Catalytic Converter Single Out Side Exit Dyno Tuned for Maximum PerformanceProduct Description: '01-'04 Chev. / GMC Truck, 3/4Ton / 1Ton HD, 6.0L / 8.1L, 2/4 Wheel Drive, Ext.Cab / Crew Cab, 3.50" Outlet, 50 Series Big Block Muffler, 4.00" Logo Embossed Stainless Tip, American Thunder, SOS (For additional sound control w/ 6.0L Use part #15131 Resonator), Mandrel Bent Tubing,16 Gauge Aluminized SteelPit Stop USA offers Flowmaster American Thunder Single Exhaust System - 2001-04 Chevy/GMC 1500/2500 HD 6.0L/8.1L 17328 at low everyday prices. Be sure to check out all our products from Flowmaster including Flowmaster Chevrolet 2500/3500 Exhaust Systems And Components, Flowmaster Chevrolet Truck / SUV Exhaust Systems and Flowmaster GMC Truck / SUV Exhaust Systems.