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Flowmaster Force II Cat-back Exhaust System

2017-2021 Ford F-250/F-350 Super Duty with 6.2L and 7.3L engines.

Part # 817757
2 Reviews
Estimated shipping date: 03/24/2022
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Delta Flow
Our Force II® line of exhaust systems are engineered as our quietest offerings, but will wake up your vehicles sound and power over the factory O.E. exhaust. You can generally expect a noticeable sound increase with a deep performance tone outside the vehicle, yet minimal interior drone in the cab area while cruising down the road enjoying all the performance benefits you've come to expect from Flowmaster®. This bolt-on emissions-legal cat-back system features full stainless steel construction, uses the factory hanger locations, 50 Series HD™ performance muffler with large 4.00-inch internals and dual 3.00-inch mandrel bent tailpipes offering two tailpipe exits in one kit. Choose your tailpipe exit either located under the rear bumper for an aggressive dual exhaust look, or exiting out the sides behind the rear tires to prevent blowing exhaust on your boat or trailer when towing. The system is finished off with a pair of large 4.00-inch polished logo embossed stainless steel tips for a modern look and includes instructions and all necessary hardware for an easy at home installation. Note: Fits 2/4 wheel drive and all wheelbases.


  • Moderate Exterior Sound with Mild Interior Sound
  • Large 4.00-inch Polished 304 Stainless Steel Tips
  • Dyno-Tuned for Maximum Performance
  • Mandrel-bent Stainless Steel Tubing
  • Uses the Factory Hanger Locations
  • 409S Stainless Steel Construction
  • 50 Series HD Performance Muffler
  • Retains Factory Resonators
  • Lifetime Limited Warranty
  • Flowmaster Quality
  • 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
Catalytic Converter IncludedNo
Emission Code5
Exhaust SeriesForce II
Exit PositionDual Out Rear / Dual Out Side
Heat ShieldNo
Material409 Stainless Steel
Mount TypeUses Factory Hangers
Muffler Body Length (in)18
Muffler ColorBlack
Muffler FinishPainted
Muffler Inlet Diameter (in)3
Muffler Inlet LocationCentered
Muffler Material409S Stainless Steel
Muffler Outlet Diameter (in)3
Muffler Outlet LocationDual Outlet
Muffler Overall Length (in)24
Muffler Part NumberKit Only
Muffler Quantity1
Muffler Series50 Series HD
Muffler ShapeOval
Muffler TypeReflection
Product TypeExhaust System
Single DualDual
Sound LevelModerate
System TypeCat-back
Tip CutAngle
Tip Diameter (in)4
Tip Edge StyleCut
Tip FinishPolished
Tip Length (in)13
Tip LogoEmbossed
Tip Material304 Stainless
Tip Quantity2
Tip ShapeRound
Tubing Diameter (in)3
Tubing Material409S Stainless Steel
California Proposition 65 Chemical NameChromium (hexavalent compounds)
California Proposition 65 RequiredYes
Part Number817757

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.

2017-2021 Ford F-250 Super Duty and F-350 Super Duty with 6.2L and 7.3L engines. Fits 2/4 wheel drive and all wheelbases.

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