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Vehicle Info NeededFLOWMASTERPART NUMBER: 389-17328
17328 American Thunder Cat-Back Exhaust System 2001-2004 GM Silverado/Sierra HD 6.0L/8.1L
$77995
Ships on 10/12/2026
Lowest Price GuaranteeGM
American Thunder Cat-Back Exhaust System2001-2004 GM Silverado/Sierra HD 6.0L/8.1L 3.5" Tubing 4" Polished SS Tips Single Side Exit 50 Series Big Block Muffler Aluminized Steel
FLOWMASTER MUFFLERS 17328 Features:
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 for the 2001-2006 (2007 Classic) Chevrolet Silverado, GMC Sierra 2500HD/3500HD with 6.0L or 8.1L engine with dual inlet muffler, 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 3.50-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 4.00-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. Covered by our 3-year Limited Warranty. Check out system #817328 if you prefer a Stainless Steel exhaust system that is covered with a Lifetime Limited Warranty.- Includes an Aluminum Heat Shield for Rapid Heat Dissipation
- Includes a Large 4.00-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
The Classic Sound of Flowmaster
Flowmaster American Thunder Exhaust Systems for Truck/SUVs are ideal for the one looking for a moderate-to-aggressive exhaust tone, inside and out. The mufflers are tuned to deliver more power, torque, throttle response, and mileage. With easy fitment in mind, each system has mandrel-bent tubing for maximum performance and flow; and includes all necessary parts and hardware for installation.
Part TypeExhaust System
Product LineFlowmaster American Thunder Exhaust Systems for Truck/SUV
BrandFLOWMASTER
Package Height15.0
Package Width18.0
Package Length63.0
Weight55.5 PG
Tailpipe Diameter (In.)3.5
Muffler Inlet Inside Diameter3.50 in.
Hangers IncludedYes
Main Piping Diameter3.50 in.
Tail Pipe QuantitySingle
Inlet TypeClamp-On
Tip CutStraight
Exhaust Tip Material304 Stainless Steel
Catalytic Converter Quantity0
Exit LocationPassenger side
Inlet QuantityTwo
Sound LevelAggressive
Muffler Body MaterialAluminized Steel
Exhaust Tip CutAngled
Gasket Or Seal IncludedNo
Exhaust Tip IntercooledNo
Pipe ColorSilver
System FinishAluminized
Muffler Quantity1
Muffler Inlet Outside Diameter3.63 in.
Exit QuantityOne
Tip MaterialStainless steel
Muffler Flanged OutletNo
Tip QuantitySingle
Exhaust Tip ResonatedNo
Exhaust TypeSingle
Catalytic Converter IncludedNo
Heat Shield IncludedNo
Part CategoryPerformance Parts
Hardware IncludedYes
Exhaust Tip WallSingle Wall
Exhaust Tip Quantity1
Muffler Inlet LocationDual
Exhaust Tip FinishPolished
Exhaust Tip EdgeRolled Edge Angle Cut
Valve IncludedNo
Muffler TypeChambered
Pipe MaterialAluminized Steel
Tail Pipe Tapered OutletNo
Muffler Body ShapeOval
Mounting Bracket IncludedNo
Muffler Outlet Quantity1
Muffler FinishBlack High-Temperature Paint Finish
Inlet Diameter3 in.
Clamps IncludedYes
Muffler StyleChambered
Tip Outlet Size4 in (101.6 mm)
FinishAluminized
Exit StyleSingle Out Side
Tip IncludedYes
Clamping TypeU-Bolt
Muffler Flanged InletNo
Spring Bolt Kit IncludedNo
Muffler Series50 Series Big Block
QuantitySold as a kit
Muffler IncludedYes
Exhaust Tip ConnectionWelded
System StyleCat Back
Tail Pipe Outlet Outside Diameter3.50 in.
Muffler ConfigurationDual inlet/Single outlet
System MaterialSteel
Valve TypeNot Applicable
Tip Edge StyleNon-rolled edge
Tip ShapeRound
Intermediate Pipe Diameter3.5 in (88.9 mm)
Exhaust Tip Diameter4 in.
Part FitmentDirect Fit
Vendor Part Number17328
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
