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Vehicle Info NeededFLOWMASTERPART NUMBER: 389-817428
817428 American Thunder Cat-Back Exhaust System 1999-2006 GM Silverado/Sierra 4.8L/5.3L (Ext Cab)
$1,17195
Ships on Sep 14, 2026
Lowest Price GuaranteeGM
- American Thunder Cat-Back Exhaust System
- 1999-2006 GM Silverado/Sierra 4.8L/5.3L (Ext Cab)
- 2.5" Tubing
- 3" Polished SS Tips
- Dual Rear/Side Exit
- Super 40 Series 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 Height11.75
Package Width16.25
Package Length58.5
Weight65.9 PG
Tailpipe Diameter (In.)2.5
Muffler Inlet Inside Diameter3 in.
Hangers IncludedYes
Main Piping Diameter2.50 in.
Tail Pipe QuantityDual
Inlet TypeFlanged
Tip CutSlant
Exhaust Tip Material304 Stainless Steel
Catalytic Converter Quantity0
Exit LocationSplit rear/Split side
Inlet QuantityOne
Muffler Body Length13.50 in.
Sound LevelAggressive / Moderate
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 QuantityTwo
Tip MaterialStainless steel
Muffler Flanged OutletNo
Tip Quantity2
Exhaust Tip ResonatedNo
Exhaust TypeSingle
Catalytic Converter IncludedNo
Heat Shield IncludedNo
Part CategoryPerformance Parts
Hardware IncludedYes
Exhaust Tip WallSingle Wall
Exhaust Tip Quantity2
Exhaust Tip FinishPolished
Exhaust Tip EdgeRolled Edge Angle Cut
Valve IncludedNo
Muffler TypeChambered
Pipe Material409 Stainless Steel
Muffler Body Width10 in.
Tail Pipe Tapered OutletNo
Muffler Body ShapeOval
Mounting Bracket IncludedYes
Muffler Outlet Quantity2
Muffler FinishBlack High-Temperature Paint Finish
Inlet Diameter3 in.
Clamps IncludedYes
Muffler StyleChambered
Tip Outlet Size2.5 in (63.5 mm)
FinishNatural
Exit StyleDual Out Rear
Muffler Body Height5 in.
Tip IncludedYes
Clamping TypeFlat Band
Muffler Flanged InletNo
Spring Bolt Kit IncludedNo
Muffler SeriesSuper 40 Series
QuantitySold as a kit
Muffler IncludedYes
Exhaust Tip ConnectionClamp-On
System StyleCat Back
Tail Pipe Outlet Outside Diameter2.50 in.
Muffler ConfigurationSingle inlet/Dual outlet
System MaterialStainless steel
Valve TypeNot Applicable
Tip Edge StyleNon-rolled edge
Tip ShapeRound
Intermediate Pipe Diameter3 in (76.2 mm)
Exhaust Tip Diameter3 in.
Part FitmentDirect Fit
Vendor Part Number817428
Package Qty1
Package TypeEA
No Questions
No Reviews
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