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Flowmaster Force II Cat-back Exhaust System

2004-2008 Ford F-150 and Lincoln Mark LT trucks with 4.6L or 5.4L engine.

PART# 17403

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$487.00   Suggested Retail
$437.95   Your Price
Estimated shipping date: 11/20/2020
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Mild sound


The Force II® system is the perfect choice for the person who wants a subtle custom appearance with all the benefits and sound that a Flowmaster® single cat-back exhaust provides. The system delivers a moderate exterior tone and mild to moderate interior tone over the factory exhaust and ideally suited for customers looking for efficiency improvements without a lot of noise. This Force II system is a bolt-on system and bumps the tubing size up to a 3.00-inch mandrel-bent aluminized steel tubing flowing into the improved muffler design of the Super 50™ Series muffler over the stock exhaust. The mandrel-bent tailpipe uses the factory hanger locations making installation a breeze and is finished off with a 3.50-inch polished stainless steel tip. The Force II system is ideal for daily drivers and especially light towing applications such as boats and RV's. Designed for an easy fit, these systems include all necessary parts and hardware for easy installation you can do at home. Aluminized Steel exhaust systems are covered by our 3-year Limited Warranty Note: This Force II system is also available in Stainless Steel with a Lifetime Limited Warranty. Check out part# 817403. Fits both 2/4 wheel drive models and all wheelbases.


  • Includes Hangers and Hardware for an Easy Installation
  • Mandrel-bent 16 Gauge Aluminized Steel Tubing
  • Large 3.50-inch Polished 304 Stainless Steel Tip
  • Dyno tuned for Maximum Performance
  • Super 50 Series Performance Muffler
  • Uses the Factory Hanger Locations
  • All Aluminized Steel Construction
  • Mild Exterior Exhaust Tone
  • 3-year Limited Warranty
  • Minimal Interior Tone
  • Flowmaster Quality


Emission Code5
Exhaust SeriesForce II
Exit PositionSingle Side Exit
Heat ShieldNo
Inlet Diameter (in)3
MaterialAluminized Steel
Muffler Part Number53055
Muffler Quantity1
Muffler SeriesSuper 50 Series
Outlet Diameter (in)3
Product TypeExhaust System
Single DualSingle
Sound LevelMild
System TypeCat-back
Tip Diameter (in)3.5
Tip Quantity1
Tubing Diameter (in)3
California Proposition 65 Chemical NameChromium (hexavalent compounds)
Nickel (Metallic)
California Proposition 65 RequiredYes
Part Number17403



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.

Tech Resources

Fits 2004-2008 Ford F-150 and Lincoln Mark LT trucks with 4.6L or 5.4L engine. Fits both 2/4 wheel drive models and all wheelbases.


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