15-20 Ford F-150 2.7L/3.5L V6 & 5.0L V8 Flowmaster 717978 Flow FX Extreme Cat-Back Exhaust System

Flowmaster Flow FX Extreme Cat-Back Exhaust System - Part #717978

The Flowmaster Flow FX Extreme Cat-Back Exhaust System (Part #717978) is engineered to deliver aggressive performance, a deep performance exhaust tone, and improved off-road capability for 2015-2020 Ford F-150 trucks. Built from durable 409 stainless steel with 3.00-inch mandrel-bent tubing, this premium exhaust system maximizes exhaust flow to help unlock dyno-proven gains of up to 18 horsepower and 9 lb-ft of torque at the rear wheels while maintaining long-term durability. The unique single dump exit eliminates the factory over-axle tailpipe, increasing ground clearance and departure angle for drivers who frequently tackle trails, rough terrain, or demanding job sites. Designed to install using the factory mounting locations and supplied hardware, this performance cat-back system delivers an aggressive yet refined exhaust note with minimal installation effort, making it an excellent upgrade for enthusiasts seeking improved sound, performance, and durability.

Key Features

• Flowmaster Part Number: 717978
• Flow FX performance muffler delivers a deep, aggressive exhaust tone.
• Dyno-proven gains of up to 18 horsepower and 9 lb-ft of torque at the rear wheels.
• Constructed from durable 409 stainless steel for long-lasting corrosion resistance.
• 3.00-inch 16-gauge mandrel-bent tubing maximizes exhaust flow.
• Single dump exit design improves ground clearance by eliminating the over-axle tailpipe.
• Utilizes factory hanger locations for a direct-fit installation.
• Includes all required clamps and installation hardware.
• Absorption-style Flow FX muffler provides improved exhaust flow and performance.
• Ideal for street-driven trucks and off-road applications.

Benefits

• Produces a powerful, performance-inspired exhaust sound without sacrificing everyday drivability.
• Improves exhaust efficiency for enhanced throttle response and overall engine performance.
• Increased ground clearance helps reduce the chance of tailpipe damage during off-road driving.
• Premium stainless steel construction helps resist rust and corrosion for years of dependable service.
• Direct-fit design minimizes installation time while eliminating the need for extensive modifications.
• Excellent upgrade for performance enthusiasts looking to enhance both appearance and sound.
• Backed by Flowmaster's Lifetime Limited Warranty for long-term confidence and peace of mind.

Product Specifications

• Part Number: 717978
• Product Type: Cat-Back Exhaust System
• Exhaust Series: Flow FX Extreme
• Material: 409 Stainless Steel
• Finish: Natural
• Color: Silver
• Main Tubing Diameter: 3.00 inches
• Tubing Thickness: 16-gauge mandrel-bent stainless steel
• Exit Style: Single Out Dump
• Sound Level: Aggressive / Moderate
• Muffler Series: Flow FX
• Muffler Type: Absorption
• Muffler Material: 409 Stainless Steel
• Muffler Body Shape: Round
• Muffler Body Diameter: 6.00 inches
• Muffler Body Length: 14.00 inches
• Muffler Overall Length: 44.30 inches
• Muffler Inlet Diameter: 3.00 inches
• Muffler Outlet Diameter: 3.00 inches
• Inlet Connection: Slip-Fit
• Inlet Type: Flanged
• Exhaust Tip Diameter: 3.00 inches
• Exhaust Tip Material: 409 Stainless Steel
• Exhaust Tip Shape: Round
• Exhaust Tip Edge: Slash Cut
• Exhaust Tip Finish: Natural
• Exhaust Tip Wall: Single Wall
• Mount Type: Factory hanger locations
• Clamps Included: Yes
• Hangers Included: Yes
• Catalytic Converter Included: No
• California Proposition 65: Yes

Install Difficulty Level

This system is designed as a direct-fit upgrade using the factory hanger locations and included hardware, making installation straightforward for most DIY enthusiasts with basic hand tools. No welding is normally required, and no extensive modifications are needed. Under ideal shop conditions, installation can be completed in as little as 2 hours, making this an easy weekend performance upgrade.

Vehicle Fitment

Fits the following vehicles:

• 2015-2020 Ford F-150 2.7L EcoBoost V6
• 2015-2020 Ford F-150 3.3L V6
• 2015-2020 Ford F-150 3.5L EcoBoost V6
• 2015-2020 Ford F-150 5.0L V8

Fitment Notes:

• Does NOT fit Standard Cab with Short Bed models.

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