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Flowmaster American Thunder Cat-back Exhaust System

Part # 17325 Be the first to write a review

1999-2002 Chevrolet Silverado 2500 & GMC Sierra 2500 with 6.0L engine - Non HD models. - Aggressive sound

Flowmaster American Thunder Cat-back Exhaust System

Estimated Ship Date: 08/31/2026
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Advertised Price $562.95
$505.95
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Delta Flow
5

Emissions

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.

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For the person who wants a subtle custom appearance with all the benefits that a Flowmaster Cat-back exhaust system provides. This American Thunder system delivers a moderate interior tone with a deep powerful exterior tone and is suited to the enthusiast who wants their performance to be heard. The system attaches to the back of the catalytic converter with a dual inlet 50 Series Big Block muffler for a deep powerful sound without being obnoxious. Includes a large custom formed aluminum heat shield with stainless clamps and easily attaches directly to the muffler body. The custom bent 3.00-inch aluminized steel tailpipe uses the factory hanger locations for an easy installation and exits out behind the right side rear wheel which is ideal for towing. The tailpipe is finished off with a large 3.50-inch polished 304 stainless steel tip embossed with the Flowmaster logo. 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 easy to follow instructions for a trouble free installation. Notes: Fits 2/4 wheel drive trucks with the extended cab/short bed configuration - 143.5-inch wheelbase.

Features:

  • Includes an Aluminum Heat Shield for Rapid Heat Dissipation
  • Includes a Large 3.50-inch Polished 304 Stainless Steel Tip
  • Includes Hangers and Hardware for an Easy Installation
  • Mandrel-bent 16-gauge Aluminized Steel Tubing
  • Dyno-tuned for Maximum Performance
  • Stainless Steel Heat Shield Clamps
  • Uses the Factory Hanger Locations
  • Aggressive Exterior Exhaust Tone
  • Easy Installation

About Flowmaster

Shop the complete line of Flowmaster products for exhaust systems, mufflers, and more that deliver the iconic Flowmaster sound. Available at Holley.com!

Brand Flowmaster
California Proposition 65Yes
CARB (California) CompliantYes
Catalytic Converter IncludedNo
Catalytic Converter Quantity0
CategoryExhaust
Clamping TypeU Bolt
Clamps IncludedYes
Emission Code5
Exhaust SeriesAmerican Thunder
Exhaust Tip ConnectionClamp-On
Exhaust Tip CutAngled
Exhaust Tip Diameter3.50 IN
Exhaust Tip EdgeRolled Edge Angle Cut
Exhaust Tip FinishPolished
Exhaust Tip IntercooledNo
Exhaust Tip Length12.00 IN
Exhaust Tip Material304 Stainless Steel
Exhaust Tip Quantity1
Exhaust Tip ResonatedNo
Exhaust Tip ShapeRound
Exhaust Tip WallSingle Wall
Exit StyleSingle Out Side
FinishAluminized
Gasket Or Seal IncludedNo
Grade TypePerformance
Hangers IncludedYes
Heat Shield IncludedYes
Inlet Diameter2.75 IN
Inlet TypeClamp-On
Main Piping Diameter3.00 IN
Mounting Bracket IncludedNo
Muffler (Left) Body Height5.00 IN
Muffler (Left) Body Length22.25 IN
Muffler (Left) Body Width12.00 IN
Muffler (Left) TypeChambered
Muffler (Right) Body Height5.00 IN
Muffler (Right) Body Length22.25 IN
Muffler (Right) Body Width12.00 IN
Muffler (Right) TypeChambered
Muffler Body MaterialAluminized Steel
Muffler Body ShapeOval
Muffler FinishBlack High-Temperature Paint Finish
Muffler Flanged InletNo
Muffler Flanged OutletNo
Muffler IncludedYes
Muffler Inlet ConnectionSlip-Fit
Muffler Inlet Inside Diameter2.75 IN
Muffler Inlet LocationDual
Muffler Inlet Outside Diameter2.88 IN
Muffler Outlet ConnectionSlip-Fit
Muffler Outlet Quantity1
Muffler Part NumberKit Only
Muffler Quantity1
Muffler Series50 Series Big Block
Muffler TypeChambered
Part TypeExhaust System
Pipe ColorSilver
Pipe MaterialAluminized Steel
Product TypeExhaust System
Sound LevelAggressive
Spring Bolt Kit IncludedNo
Sub CategoryExhaust and Tail Pipes
Tail Pipe Outlet Outside Diameter3.00 IN
Tail Pipe Quantity1
Single
Tail Pipe Tapered OutletNo
TypeCat-Back
Valve IncludedNo
Valve TypeNot Applicable
UPC700042017409
California Proposition 65 Chemical NameChromium (hexavalent compounds)
Nickel (Metallic)
Part Number17325
5

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.
Fits 1999-2002 Chevrolet Silverado and GMC Sierra 2500 3/4 Ton truck (not-HD) with 6.0L engine, fits 2/4 wheel drive with extended cab/short bed configuration on 143.5-inch wheelbase.
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