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Flowmaster American Thunder Cat-back Exhaust System

1996-1999 Chevrolet Silverado, GMC Sierra 2500/3500 5.7L HD or 7.4L engine. (See applications below)

PART# 17224

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Moderate sound


This Flowmaster American Thunder® cat-back exhaust system is custom designed for 1996-1999 Chevrolet Silverado and GMC Sierra 2500/3500 trucks with the 5.7L and 7.4L engine is perfect for the person looking for a moderate sound level inside and outside of the truck, with all of the performance benefits that expect from Flowmaster®. This bolt-on emissions-legal system features a dual 3.00-inch inlet 50 Series Big Block™ muffler for a deep powerful tone and includes an aluminum heat shield and stainless steel clamps. The single 3.00-inch aluminized steel mandrel-bent tailpipe uses the factory hanger locations and is finished off with a turndown style tip that exits behind the right rear wheel which is ideal for towing. The exhaust system is covered by our 3-year Limited Warranty and includes all necessary parts and hardware for a quick and easy installation you can do at home. Notes: Fits 2/4 wheel drive extended cab/long bed configuration and Crew Cab Dually. Fits 155-inch and 168-inch wheel bases.


  • Includes an Aluminum Heat Shield and Stainless Steel Clamps
  • Includes Hangers and Hardware for an Easy Installation
  • Mandrel-bent 16-gauge Aluminized Steel Tubing
  • 50 Series Big Block Series Performance Muffler
  • Dyno Tuned for Maximum Performance
  • Uses the Factory Hanger Locations
  • Moderate Exterior Exhaust Tone
  • Easy Installation


Emission Code5
Exhaust SeriesAmerican Thunder
Exit PositionSingle Side Exit
Heat ShieldNo
Inlet Diameter (in)2.75
Inlet PositionDual
MaterialAluminized Steel
Muffler Part NumberKit Only
Muffler Quantity1
Muffler Series50 Series Big Block
Outlet Diameter (in)3
Product TypeExhaust System
Single DualSingle
Sound LevelModerate
System TypeCat-back
Tip QuantityNot Included
Tubing Diameter (in)3
California Proposition 65 Chemical NameChromium (hexavalent compounds)
Nickel (Metallic)
California Proposition 65 RequiredYes
Part Number17224



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 1996-1999 Chevrolet Silverado and GMC Sierra truck 3/4 Ton and 1 Ton with fuel injected 5.7L HD or 7.4L engine, fits 2/4 wheel drive extended cab/long bed configuration and Crew Cab Dually. Fits 155-inch and 168-inch wheelbases and requires welding.


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