Enter Garage
Representative imageManufacturer information. Check the part number and installation requirements for your vehicle.
Supplier details checked 2026-09-23 · Test catalog
Fits 2001-2003 Chevrolet Silverado, GMC Sierra 1500 HD truck with 6.0L engine. - Moderate sound
Flowmaster American Thunder Cat-back Exhaust System
Includes Hangers and Hardware for an Easy Installation
Large 3.50-inch Polished 304 Stainless Steel Tip
Mandrel-bent 16-gauge Aluminized Steel Tubing
70 Series Big Block II Performance Muffler
Mild to Moderate Exterior Exhaust Tone
Dyno Tuned for Maximum Performance
Includes a 3-year Limited Warranty
Uses the Factory Hanger Locations
Minimal Interior Sound
Easy Installation
Fits 2001-2003 Chevrolet Silverado and GMC Sierra 1500 HD truck with 6.0L engine, fits 2/4 wheel drive models with crew cab/short bed configuration.
Flowmaster 01-03 GM 1500HD 6.0L CCB American Thunder Exhaust System
0103 GM 1500HD 60L CCSB AMT
SYS 01-03 GM 1500HD
For the person who wants a subtle custom appearance with all the benefits that a Flowmaster® Force II® cat-back exhaust system provides, the S.O.S. (Single out side) systems are the perfect choice. The 3.00-inch mandrel-bent aluminized steel tubing flows into a large case dual inlet 50 Series™ Big Block performance muffler that delivers a deep moderate exterior tone while retaining a mild to moderate interior tone. The 3.00-inch tailpipe uses the factory hanger locations for an easy installation and is finished off with a large 3.50-inch polished 304 stainless steel tip. This system is best suited towards customers looking for efficiency improvements without a lot of noise. Especially recommended for towing applications. Like all Flowmaster systems, the benefits include improved throttle response, power and mileage. Designed for an easy fit, these systems include all necessary parts, hardware and is covered by our 3-year Limited Warranty.
SYS 01-03 GM
