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

The Flowmaster American Thunder Axle-Back Exhaust System delivers an aggressive muscle car exhaust note, improved exhaust flow, and premium stainless steel durability for 2018-2023 Ford Mustang GT 5.0L models. Featuring Super 44® mufflers, quad polished tips, and a direct bolt-on design, this system offers enhanced performance, premium styling, and a Lifetime Limited Warranty.

Top Features

  • Part Number: 817807
  • American Thunder® axle-back exhaust system
  • Fits vehicles without Factory Active Performance Exhaust
  • 3.00-inch mandrel-bent 409 stainless steel tubing
  • Dual Super 44® chambered performance mufflers
  • Quad 4.00-inch polished 304 stainless steel exhaust tips
  • Aggressive exterior sound with moderate interior tone
  • Direct bolt-on installation using factory hanger locations
  • Hardware and clamps included
  • Backed by Flowmaster's Lifetime Limited Warranty

Vehicle Fitment

  • 2018-2023 Ford Mustang GT 5.0L V8 Coupe (Without Factory Active Performance Exhaust)
  • 2018-2023 Ford Mustang GT 5.0L V8 Convertible (Without Factory Active Performance Exhaust)
Vendor: Flowmaster
SKU: FLO817807
Availability: 9 In Stock
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UPC: 700042037629
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Description

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.

Shipping & Returns

Shipping Policy

MPT is proud to offer free shipping on most orders over $149.

  • Free shipping applies only to the contiguous United States. Shipping and handling charges will apply to orders outside the contiguous US, and the buyer is responsible for any duty fees or taxes their home country may charge to import goods.
  • With free shipping, we will choose the best shipping method for your order. We use all major carriers, including USPS, FedEx, UPS, and DHL.

Turnaround Times:

  • MPT Tunes have a standard turnaround time of 2-3 business days, beginning once we receive your MPT Tune Form.
  • We do not process orders on weekends or observed holidays, which do not count as business days.
  • Physical items that are in stock at MPT and ordered by 4PM EST will be shipped the same day. Orders placed after 4PM EST will be processed on the following business day.

Special Considerations:

  • Items not stocked at our location will follow the same processing times but may experience lead-time delays and could incur additional charges. Shipping methods may vary for these items based on what was paid and the requested delivery speed. If you need an item by a specific deadline, please contact an MPT Expert.
  • SCT Tuner Orders with the Prioritized Order option must have their tune forms submitted by 3PM EST to be completed the same day. Forms submitted after this time will be processed the next business day.
  • Orders will ship to the billing address listed on your order. If paying by credit or debit card, we can only ship to the billing address. Contact an MPT Expert for assistance if you need a different shipping address.

MPT Performance Returns and Refund Policy

A Return Authorization Number is required for all returns. Please contact an MPT Expert to obtain an RA # before sending anything back to us for any reason.

MPT tuning charges and license fees are Non-Refundable. The sale is final when MPT has sent the tune file over email. This includes both new tune purchases and tune updates.

Products other than MPT tunes, digital products, and MPT decals may be returned within 30 days for any reason, provided that the product has not been installed and is in brand new, unused condition with the original packaging. Once a product has been installed it is non-refundable. We reserve the right to deny the return, should the product be received and it display signs of installation or unmentioned damage.

For vehicle programmers/tuners, the vehicle must be returned to stock if a program was installed. If a tuning device is returned and has not been returned to stock, a refund will not be issued, and your tuner will not be sent back without a shipping and handling fee.

The customer is responsible for all shipping charges incurred during the return process.

Amount Refunded:
•Returns post marked before 30 days from the date the item was received will be refunded the purchase price, minus a 25% restocking fee and the cost of shipping.
•After 30 days, all sales are Final.
•Shipping charges along with any package insurance are non-refundable. If your purchase was shipped with our Free Shipping option, the cost of the shipping will be subtracted from the total refund amount.

HP Tuners Credits are assigned to the HP Tuners product with the submitted serial number and cannot be transferred. Once you load a tune to your vehicle with the RTD, these credits are Non-Refundable.

Digital products and files that have no ability to be taken back physically, such as an SCT Tuner Unlock, are Non-Refundable.

nGauge Tune License Fee is included in your initial purchase of MPT tunes for the nGauge. This fee is factored into the price of the tunes and becomes Non-Refundable when the stock file has been emailed to MPT.

MPT Decals are Non-Refundable, once they have been received by the customer.

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