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Flowmaster American Thunder Cat-back Exhaust System

2001-2003 Chevrolet Silverado, GMC Sierra 1500 HD truck with 6.0L engine. (See applications below)

PART# 17350

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Moderate sound


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.


  • Includes Hangers and Hardware for an Easy Installation
  • Mandrel-bent 16-gauge Aluminized Steel Tubing
  • Large 3.50-inch Polished 304 Stainless Steel Tip
  • 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


Emission Code5
Exhaust SeriesAmerican Thunder
Exit PositionSingle Side Exit
Heat ShieldNo
Inlet Diameter (in)3
Inlet PositionDual
MaterialAluminized Steel
Muffler Part NumberKit Only
Muffler Quantity1
Muffler Series50 Series Big Block
Outlet Diameter (in)3.5
Product TypeExhaust System
Single DualSingle
Sound LevelModerate
System TypeCat-back
Tip Diameter (in)4
Tip Quantity1
Tubing Diameter (in)3.5
California Proposition 65 Chemical NameChromium (hexavalent compounds)
Nickel (Metallic)
California Proposition 65 RequiredYes
Part Number17350



This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

Tech Resources

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.


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