1-866-464-6553
Flowmaster

Flowmaster American Thunder Cat-back Exhaust System

Part # 817541 Be the first to write a review

Fits 2011-2019 Chevrolet Silverado, GMC Sierra 2500HD/3500HD with 6.0L engine - Aggressive to moderate sound

Flowmaster American Thunder Cat-back Exhaust System

Estimated Ship Date: 06/30/2025
Find Similar In-Stock Items
Free Shipping
$1,249.95
Add to Wishlist
Notify Me When Available

Does it fit my vehicle?
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.

See Emissions Details

Also Bought

The new Flowmaster American Thunder® Cat-back exhaust system for 2011-2019 Chevy Silverado and GMC Sierra 2500HD/3500HD trucks with 6.0L, is perfect for the person looking for a moderate to aggressive sound level inside and outside of the truck, with all of the performance benefits that you would expect from Flowmaster®. Designed for the Crew Cab, Standard Bed (6.5 ft.) models only, this bolt-on, emissions-legal system features a stainless steel 50 Series HD™ muffler and large dual 3.00-inch stainless steel mandrel bent tailpipes that can be configured to exit either dual out the sides, or dual straight out the back. The system is finished off with beautifully polished 4.00-inch stainless steel tips and is covered by our Lifetime Limited Warranty. Designed for an easy fit, this system includes all necessary parts and hardware for installation. Notes: Fits Crew Cab with 6.5' bed length. 153.7" wheelbase only.

Features:

  • Uses the Factory Hanger Locations for Easy Installation
  • 50 Series HD Muffler with Delta Flow Technology
  • Multiple Tailpipe Exits Provided in Kit
  • Large 3.00-inch Dual Tailpipes
  • Stainless Steel Construction
  • Lifetime Limited Warranty
  • Flowmaster Quality
2WD/4WD2WD
4WD
Brand Flowmaster
Catalytic Converter Quantity0
CategoryExhaust
Clamping TypeFlat Band
Clamps IncludedYes
Emission Code5
Exhaust SeriesAmerican Thunder
Exhaust System Kit TypeCat-Back
Exhaust Tip ColorSilver
Exhaust Tip ConnectionClamp-On
Exhaust Tip CutAngled
Exhaust Tip Diameter4.00 IN
Exhaust Tip EdgeAngle Cut
Exhaust Tip FinishPolished
Exhaust Tip IntercooledNo
Exhaust Tip Length13.00 IN
Exhaust Tip Material304 Stainless Steel
Exhaust Tip Quantity2
Exhaust Tip ResonatedNo
Exhaust Tip ShapeRound
Exhaust Tip WallDouble Wall
Exit PositionDual Out Rear / Dual Out Side
Exit StyleDual Out Rear
Dual Out Side
FinishNatural
Gasket Or Seal IncludedNo
Grade TypePerformance
Hangers IncludedYes
Heat ShieldNo
Inlet Diameter3.50 IN
Inlet TypeFlanged
Main Piping Diameter4.00 IN
Material409 Stainless Steel
Mounting Bracket IncludedYes
Muffler Body Height5.00 IN
Muffler Body Length18.25 IN
Muffler Body Material409 Stainless Steel
Muffler Body ShapeOval
Muffler Body Width10.00 IN
Muffler FinishBlack High-Temperature Paint Finish
Muffler Flanged InletNo
Muffler Flanged OutletNo
Muffler Inlet ConnectionSlip-Fit
Muffler Inlet Inside Diameter3.50 IN
Muffler Inlet Outside Diameter3.63 IN
Muffler Outlet ConnectionSlip-Fit
Muffler Outlet Quantity2
Muffler Part NumberKit Only
Muffler Quantity1
Muffler Series50 Series HD
Muffler TypeChambered
Outlet Diameter3.00 IN
part typeExhaust System Kit
Pipe Material409 Stainless Steel
Product TypeExhaust System
Single DualDual
Sound LevelAggressive / Moderate
Spring Bolt Kit IncludedNo
Sub CategoryExhaust and Tail Pipes
System TypeCat-back
Tail Pipe Outlet Outside Diameter3.00 IN
Tail Pipe Quantity2
Tail Pipe Tapered OutletNo
Tip Diameter4.00 IN
Tip Length13.00 IN
Tip Quantity2
Tip ShapeRound
Tubing Diameter4.00 IN
TypeCat-Back
Valve IncludedNo
Valve TypeNot Applicable
UPC700042030019
California Proposition 65 Chemical NameChromium (hexavalent compounds)
Nickel (Metallic)
California Proposition 65 RequiredYes
Part Number817541
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.
Instructions - fm_warranty_general.pdf
Instructions - 817541_instructions.pdf
Fits 2011-2019 Chevrolet Silverado and GMC Sierra 2500HD/3500HD Crew cab/standard 6.5-foot bed models with 6.0L gas engine. 153.7" wheelbase.

We Suggest

Reviews

    Your Review

    *Free Shipping & Handling only offered to the contiguous US on orders over $1490, excludes clearance parts and oversized packages.

    Some parts are not legal for use in California or other states with similar regulations.