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Vehicle Info NeededFLOWMASTERPART NUMBER: 389-817328
817328 American Thunder Cat-Back Exhaust System 2001-2004 GM Silverado/Sierra HD 6.0L/8.1L
$89995
Ships on 10/29/2026
Lowest Price GuaranteeGM
- American Thunder Cat-Back Exhaust System
- 2001-2004 GM Silverado/Sierra HD 6.0L/8.1L
- 3.5" Tubing
- 4" Polished SS Tips
- Single Side Exit
- 50 Series Big Block Muffler
- 409S Stainless Steel
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 Height10.0
Package Width15.0
Package Length58.0
Weight61.0 PG
Tailpipe Diameter (In.)3.5
Muffler Inlet Inside Diameter3 in.
Hangers IncludedYes
Main Piping Diameter3.50 in.
Tail Pipe QuantitySingle
Inlet TypeClamp-On
Tip CutSlant
Exhaust Tip Material304 Stainless Steel
Catalytic Converter Quantity0
Exit LocationPassenger side
Inlet QuantityOne
Muffler Body Length22 in.
Sound LevelAggressive
Muffler MaterialStainless steel
Muffler Body Material409 Stainless Steel
Exhaust Tip CutAngled
Gasket Or Seal IncludedNo
Exhaust Tip IntercooledNo
Pipe ColorSilver
System FinishNatural
Muffler Quantity1
Muffler Inlet Outside Diameter3.13 in.
Exit QuantityOne
Tip MaterialStainless steel
Muffler Flanged OutletNo
Tip Quantity1
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 Material409 Stainless Steel
Muffler Body Width12 in.
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)
FinishNatural
Exit StyleSingle Out Side
Muffler Body Height5 in.
Tip IncludedYes
Clamping TypeFlat Band
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 MaterialStainless steel
Valve TypeNot Applicable
Tip Edge StyleNon-rolled edge
Tip ShapeRound
Intermediate Pipe Diameter3 in (76.2 mm)
Exhaust Tip Diameter4 in.
Part FitmentDirect Fit
Vendor Part Number817328
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
