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Vehicle Info NeededFLOWMASTERPART NUMBER: 389-817470
817470 American Thunder Cat-Back Exhaust System 1996-1999 GM Silverado/Sierra 5.7L
$1,17795
Ships on Sep 14, 2026
Lowest Price GuaranteeGM
American Thunder Cat-Back Exhaust System1996-1999 GM Silverado/Sierra 5.7L (Ext Cab) 2.5" Tubing 3" Polished SS Tips Dual Rear/Side Exit 70 Series Big Block Muffler 409S Stainless Steel
FLOWMASTER MUFFLERS 817470 Features:
For the person who wants the look of a traditional dual exhaust system with all the benefits that a Flowmaster® cat-back exhaust system provides. The American Thunder® exhaust systems are the perfect choice for the person wanting a deep powerful tone outside, with a mild to moderate increase of sound inside the cab. The exhaust system features a dual inlet flange that attaches to the factory flange behind the catalytic converters, all mandrel-bent stainless steel tubing flowing into a Scavenger Series Y-pipe for maximum scavenging of exhaust resulting in increased torque. The system then flows into a 70 Series™ "Big Block II" performance muffler giving you a deep powerful tone outside, and mild to moderate interior tone inside the cab. The dual tailpipes can be configured for either dual out the rear under the bumper for a muscular look, or dual out the sides behind the rear wheels, which is ideal for towing applications. The tailpipes are then finished off with a pair of 3.00-inch polished 304 stainless steel tips. Like all Flowmaster systems, the benefits include improved throttle response, power and mileage. Designed for an easy fit, these systems include all necessary parts and hardware for an easy installation and is covered by our Lifetime Limited Warranty. Note: Fits 2 and 4 wheel drives with the extended cab/shortbed chassis.- Includes Hangers and Hardware for an Easy Installation
- Mandrel-bent 16-gauge Stainless Steel Tubing
- Dual 3.00-inch Polished Stainless Steel Tips
- Connects After Factory Catalytic Converter
- Covered by our Lifetime Limited Warranty
- Deep Powerful Exterior Exhaust Tone
- Uses the Factory Hanger Locations
- 70 Series Performance Muffler
- Lifetime Limited Warranty
- Includes all Hardware
- Easy Installation
Part TypeExhaust System
BrandFLOWMASTER
Package Height11.25
Package Width16.0
Package Length58.0
Weight70.1 PG
Part CategoryPerformance Parts
Hardware IncludedYes
Tailpipe Diameter (In.)2.5
Tip CutStraight
Exit LocationSplit side
Muffler StyleChambered
Inlet QuantityTwo
Tip Outlet Size3 in (76.2 mm)
Tip IncludedYes
QuantitySold as a kit
System FinishNatural
Muffler IncludedYes
Muffler QuantityOne
System StyleCat Back
Muffler ConfigurationSingle inlet/Dual outlet
System MaterialStainless steel
Exit QuantityTwo
Tip MaterialStainless steel
Tip Edge StyleRolled edge
Tip Quantity2
Tip ShapeRound
Intermediate Pipe Diameter3 in (76.2 mm)
Part FitmentDirect Fit
Exhaust TypeSingle
Vendor Part Number817470
Package Qty1
Package TypeEA
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17470 American Thunder Cat-Back Exhaust System 1996-1999 GM Silverado/Sierra 5.7L
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$89995
Some parts are not legal for use in California or other states with similar laws / regulations
