18-23 Ford Mustang GT 5.0L V8 Flowmaster 817807 American Thunder Axle-Back Exhaust System (No Valves)

Flowmaster American Thunder Axle-Back Exhaust System (No Valves) - Part #817807

The Flowmaster American Thunder® Axle-Back Exhaust System is engineered to give the 2018-2023 Ford Mustang GT 5.0L a bold, unmistakable muscle car sound while improving exhaust flow and maintaining a comfortable interior tone during highway cruising. Designed specifically for Mustang GT models without the factory Active Performance Exhaust, this premium bolt-on system combines durable 409S stainless steel construction with legendary Super 44® chambered mufflers to deliver enhanced performance, aggressive exterior exhaust note, and long-lasting reliability. Finished with eye-catching quad 4.00-inch polished 304 stainless steel tips, this axle-back system provides an aggressive appearance that perfectly complements the S550 Mustang. Every kit includes the necessary hardware and utilizes the factory mounting locations, making it an excellent upgrade for enthusiasts looking for improved sound, premium quality, and hassle-free installation.

Key Features

• Flowmaster American Thunder® Axle-Back Exhaust System
• Part Number: 817807
• Designed for 2018-2023 Ford Mustang GT 5.0L models without Factory Active Performance Exhaust Valves
• Aggressive exterior exhaust tone with a moderate interior cruising sound
• Dual Super 44® chambered performance mufflers
• Mandrel-bent 3.00-inch 409S stainless steel tubing for maximum exhaust flow
• Quad 4.00-inch polished 304 stainless steel exhaust tips
• Dyno-tuned to maximize horsepower, torque, and exhaust efficiency
• Uses factory hanger locations for a true bolt-on installation
• Includes clamps, hardware, and installation instructions
• Fits both Coupe and Convertible models

Benefits

• Produces the signature deep Flowmaster performance exhaust sound Mustang enthusiasts demand.
• Improves exhaust flow for enhanced engine performance and throttle response.
• Premium stainless steel construction helps resist corrosion for long service life.
• Large polished quad tips deliver an aggressive, factory-quality appearance.
• Bolt-on design requires no welding for a straightforward installation.
• Maintains a comfortable cabin sound during normal cruising while delivering an aggressive tone during acceleration.
• Backed by Flowmaster's Lifetime Limited Warranty for long-term confidence and peace of mind.
  

Product Specifications

• Brand: Flowmaster
• Part Number: 817807
• Product Type: Axle-Back Exhaust System
• Exhaust Series: American Thunder®
• Main Tubing Diameter: 3.00 inches
• Pipe Material: 409 Stainless Steel
• Pipe Finish: Natural
• Muffler Series: Super 44®
• Muffler Type: Chambered Reflection
• Muffler Material: 409 Stainless Steel
• Muffler Finish: Black High-Temperature Paint
• Muffler Quantity: 2
• Muffler Body Shape: Oval
• Muffler Body Dimensions: 13.00 in. Length x 9.50 in. Width x 4.00 in. Height
• Exhaust Tip Quantity: 4
• Exhaust Tip Diameter: 4.00 inches
• Exhaust Tip Length: 5.25 inches
• Exhaust Tip Material: 304 Stainless Steel
• Exhaust Tip Finish: Polished
• Exhaust Tip Color: Silver
• Exhaust Tip Style: Round, Double Wall, Angle Cut
• Exit Style: Dual Rear Exit
• Inlet Connection: Slip-Fit Clamp-On
• Clamps Included: Yes
• Hangers Included: Yes
• Mounting Style: Uses Factory Hanger Locations
• Sound Level: Aggressive Exterior / Moderate Interior
• Valve Provision: None
• Catalytic Converters Included: No

Install Difficulty Level

This exhaust system is designed as a direct bolt-on upgrade that installs using the factory hanger locations without welding or permanent modifications. All required clamps, hardware, and instructions are included, making installation straightforward for most enthusiasts with basic hand tools. Under ideal conditions, installation can be completed in approximately 2 hours, making it an excellent weekend performance upgrade.

Vehicle Fitment

Fits the following vehicles:

• 2018 Ford Mustang GT 5.0L V8 Coupe (Without Factory Active Performance Exhaust)
• 2018 Ford Mustang GT 5.0L V8 Convertible (Without Factory Active Performance Exhaust)
• 2019 Ford Mustang GT 5.0L V8 Coupe (Without Factory Active Performance Exhaust)
• 2019 Ford Mustang GT 5.0L V8 Convertible (Without Factory Active Performance Exhaust)
• 2020 Ford Mustang GT 5.0L V8 Coupe (Without Factory Active Performance Exhaust)
• 2020 Ford Mustang GT 5.0L V8 Convertible (Without Factory Active Performance Exhaust)
• 2021 Ford Mustang GT 5.0L V8 Coupe (Without Factory Active Performance Exhaust)
• 2021 Ford Mustang GT 5.0L V8 Convertible (Without Factory Active Performance Exhaust)
• 2022 Ford Mustang GT 5.0L V8 Coupe (Without Factory Active Performance Exhaust)
• 2022 Ford Mustang GT 5.0L V8 Convertible (Without Factory Active Performance Exhaust)
• 2023 Ford Mustang GT 5.0L V8 Coupe (Without Factory Active Performance Exhaust)
• 2023 Ford Mustang GT 5.0L V8 Convertible (Without Factory Active Performance Exhaust)

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