04-08 Ford F-150 4.6L/5.4L Flowmaster 817403 Force II Cat-back Exhaust System

Flowmaster Force II Cat-back Exhaust System - Part Number 817403

The Flowmaster Force II Cat-back Exhaust System 817403 is designed for 2004-2008 Ford F-150 and Lincoln Mark LT trucks equipped with 4.6L or 5.4L engines. This performance exhaust upgrade delivers a refined mild exhaust tone, improved appearance, and enhanced exhaust flow without creating excessive cabin noise. Featuring 3-inch mandrel-bent stainless steel tubing and a Super 50 Series chambered muffler, this system provides a premium balance of sound quality, durability, and everyday drivability. The single side exit design, polished stainless steel tip, and factory hanger compatibility make this system an excellent choice for daily drivers, truck enthusiasts, and light towing applications.

Key Features

• Designed specifically for 2004-2008 Ford F-150 and Lincoln Mark LT trucks with 4.6L and 5.4L engines.
• Force II Series performance exhaust system delivers a mild exterior exhaust tone with minimal interior drone.
• Includes a Super 50 Series chambered performance muffler for a controlled, aggressive exhaust note.
• Features 3-inch mandrel-bent stainless steel tubing for smooth exhaust flow and long-term durability.
• Includes a large 3.50-inch polished 304 stainless steel exhaust tip for an upgraded custom appearance.
• Uses factory hanger locations for a straightforward bolt-on installation.
• Includes required hangers, clamps, and hardware for installation convenience.
• Connects after the factory catalytic converter without requiring catalytic converter replacement.

Benefits

• Provides a premium Flowmaster exhaust sound while maintaining comfortable everyday driving characteristics.
• Improves exhaust flow compared to restrictive factory exhaust components.
• Ideal for truck owners seeking a performance upgrade without an overly loud exhaust system.
• Excellent choice for daily driving, hauling, and light towing applications such as boats and RVs.
• Stainless steel construction provides excellent corrosion resistance and long-lasting performance.
• Backed by Flowmaster's Lifetime Limited Warranty for stainless steel exhaust systems.
• Designed for an easy fit with included hardware to simplify installation.

Product Specifications

• Brand: Flowmaster
• Part Number: 817403
• Product Type: Cat-back Performance Exhaust System
• Exhaust Series: Force II
• Sound Level: Mild
• Material: 409 Stainless Steel Pipe and Muffler Body
• Exhaust Tip Material: 304 Stainless Steel
• Exhaust Tip Finish: Polished Silver
• Exhaust Tip Diameter: 3.50 inches
• Exhaust Tip Length: 13.00 inches
• Main Piping Diameter: 3.00 inches
• Muffler Series: Super 50 Series
• Muffler Type: Chambered
• Muffler Body Size: 17.25 inches Long x 10.00 inches Wide x 5.00 inches High
• Muffler Finish: Black High-Temperature Paint Finish
• Exit Style: Single Side Exit
• Exhaust Tip Shape: Round
• Exhaust Tip Cut: Angled with Rolled Edge
• Drive Compatibility: 2WD and 4WD
• Catalytic Converter Included: No
• Clamps Included: Yes
• Hangers Included: Yes
• Emission Code: 5
• CARB Compliant: Yes

Install Difficulty level

This Flowmaster Force II Cat-back Exhaust System is considered an easy installation project for enthusiasts with basic mechanical skills. The bolt-on design uses factory hanger locations and includes necessary hardware, allowing installation to be completed smoothly with common tools. Installation can typically be completed in under one hour when the vehicle is properly prepared and the correct tools are available.

Vehicle Fitment

• 2004-2008 Ford F-150 - 4.6L V8 Engine
• 2004-2008 Ford F-150 - 5.4L V8 Engine
• 2004-2008 Lincoln Mark LT - 4.6L V8 Engine
• 2004-2008 Lincoln Mark LT - 5.4L V8 Engine
• Fits 2-wheel drive and 4-wheel drive models.
• Fits all wheelbase configurations.

For questions about this product or to report product description inaccuracies, contact the MPT Performance experts at (407) 636-7077 or by email.