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Flowmaster Force II Cat-back Exhaust System

2011-2015 Chevrolet Silverado, GMC Sierra 2500HD, 3500 HD with 6.0L gas engines. Fits Extra Cab/Standard Bed Only.

Part # 817640 Be the first to write a review
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Delta Flow
This Force II® cat-back exhaust system is for 2011-2015 GM 2500HD/3500HD extended cab/short bed trucks with the 6.0L gas engine, and is perfect for the person looking for mild to moderate sound levels with all of the performance benefits that you would expect from Flowmaster®. This bolt-on emissions legal system features a 50 Series Big Block™ muffler, mandrel-bent 3.50-inch stainless steel tubing, a polished 4.00-inch stainless steel tip embossed with the Flowmaster logo. The system is covered by Flowmaster's Lifetime Limited Warranty and includes all necessary parts, hardware and instructions for an easy installation you can do at home.


  • Dyno Tuned For Maximum Performance
  • Uses the Factory Hanger Locations
  • Featuring Delta Flow Technology
  • Stainless Steel Construction
  • Mandrel-bent Construction
  • Lifetime Limited Warranty
  • Easy Installation

About Flowmaster

Flowmaster® is a household name, and for good reason. They've built legendary exhaust systems and mufflers for decades, and now offer performance air intakes, catalytic converters, and headers to give your hot rod performance to match the iconic Flowmaster sound.

Brand Flowmaster
Emission Code5
Exhaust Pipe Bend TypeAssorted
Exhaust Pipe Max Diameter (in)2.5
Exhaust SeriesForce II
Exit PositionSingle Out Side
Heat ShieldNo
Inlet Diameter (in)3.5
Material409 Stainless Steel
Muffler Part NumberKit Only
Muffler Quantity1
Muffler Series50 Series Big Block
Outlet Diameter (in)3.5
Product TypeExhaust System
Single DualSingle
Sound LevelModerate/Mild
System TypeCat-back
Tip Diameter (in)4
Tip Length (in)10
Tip Quantity1
Tubing Diameter (in)3.5
California Proposition 65 Chemical NameChromium (hexavalent compounds)
Nickel (Metallic)
California Proposition 65 RequiredYes
Part Number817640

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.

Fits 2011-2015 Chevrolet Silverado, GMC Sierra 2500HD, 3500 HD with 6.0L gas engines. Fits Extra Cab/Standard Bed Only.

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