Free shipping on orders over $100 - Details

Flowmaster Force II Cat-back Exhaust System

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

Part # 817403 Be the first to write a review
Estimated shipping date: 03/04/2022
Notify Me When Available
Free Shipping
Your Price
Suggested Retail
Add to Wish List
Create a new list
Starting at $51 a month with Learn More
Delta Flow
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-inch mandrel-bent stainless 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. Stainless Steel exhaust systems are covered by our Lifetime Limited Warranty. Note: This Force II system is also available in Aluminized steel with a 3-year Limited Warranty. Check out part# 17403 for the Aluminized steel option. Fits both 2/4 wheel drive models and all wheelbases.


  • Includes Hangers and Hardware for an Easy Installation
  • Large 3.50-inch Polished 304 Stainless Steel Tip
  • Mandrel-bent 16-gauge Stainless Steel Tubing
  • Connects After Factory Catalytic Converter
  • Super 50 Series Performance Muffler
  • Great Choice for Towing Applications
  • Uses the Factory Hanger Locations
  • Moderate Exterior Exhaust Tone
  • Lifetime Limited Warranty
  • Minimal Interior Drone
  • Flowmaster Quality

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 SeriesForce II
Exit PositionSingle Side Exit
Heat ShieldNo
Inlet Diameter (in)3
Material409 Stainless Steel
Muffler Part NumberKit Only
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 Number817403

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 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.

    Your Review

    *Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages.

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