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13-14 Ford Mustang GT 5.0L V8 Flowmaster 817588 American Thunder Axle-back Exhaust System

The Flowmaster American Thunder Axle-back Exhaust System delivers an aggressive exhaust tone and improved styling for 2013-2014 Ford Mustang GT 5.0L V8 models. Featuring Super 44 Series mufflers, 3.00-inch mandrel-bent tubing, and polished stainless steel tips, this bolt-on system provides enhanced sound, performance, and durability with a factory-style fit.

Top Features

  • Flowmaster American Thunder Series axle-back exhaust system
  • Super 44 Series chambered performance mufflers for a deep, aggressive sound
  • 3.00-inch mandrel-bent 409 stainless steel tubing
  • Dual 4.00-inch polished stainless steel exhaust tips
  • Uses factory hanger locations for easy installation
  • Dyno tuned for improved exhaust performance and sound quality
  • Includes clamps and necessary installation hardware
  • Backed by Flowmaster Lifetime Limited Warranty

Vehicle Fitment

  • 2013 Ford Mustang GT 5.0L V8 Coupe
  • 2013 Ford Mustang GT 5.0L V8 Convertible
  • 2014 Ford Mustang GT 5.0L V8 Coupe
  • 2014 Ford Mustang GT 5.0L V8 Convertible
Vendor: Flowmaster
SKU: FLO817588
Availability: 4 In Stock
$ 779.95 USD
On-Sale $ 779.95 USD
Normally $ 779.95 USD
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UPC: 700042027576
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Flowmaster American Thunder Axle-back Exhaust System

Part Number: 817588

The Flowmaster American Thunder Axle-back Exhaust System 817588 is designed for 2013-2014 Ford Mustang GT models equipped with the 5.0L V8 engine and delivers the aggressive exhaust tone performance enthusiasts expect from a legendary Flowmaster system. Featuring Super 44 Series chambered mufflers, 3.00-inch mandrel-bent tubing, and large polished stainless steel tips, this axle-back exhaust upgrade enhances the Mustang’s appearance while producing a deep, powerful sound with a moderate interior tone at varying RPM levels. The bolt-on design uses factory hanger locations for a straightforward installation and provides a performance-focused upgrade without replacing the entire exhaust system. Constructed from durable 409 stainless steel and backed by a Flowmaster Lifetime Limited Warranty, this American Thunder exhaust system is built for long-lasting performance and style.

Key Features

  • Designed specifically for 2013-2014 Ford Mustang GT 5.0L V8 coupes and convertibles
  • Flowmaster American Thunder Series axle-back exhaust system with aggressive exterior sound
  • Includes dual Super 44 Series chambered performance mufflers
  • Uses large 3.00-inch mandrel-bent tubing for improved exhaust flow
  • Features large 4.00-inch polished stainless steel exhaust tips for a premium appearance
  • Dyno tuned for performance-oriented sound and exhaust efficiency
  • Direct bolt-on design uses factory hanger locations
  • Includes necessary clamps and hardware for installation
  • Manufactured from durable 409 stainless steel construction

Benefits

  • Provides a deeper, more aggressive exhaust note that enhances the Mustang GT driving experience
  • Improves the appearance of the rear of the vehicle with polished stainless steel tips
  • Offers reliable performance from Flowmaster’s proven Super 44 Series muffler technology
  • Maintains a comfortable interior tone while delivering an upgraded exterior sound
  • Provides a simple upgrade path compared to replacing the complete exhaust system
  • Designed for a clean factory-style fitment with an aftermarket performance advantage
  • Backed by Flowmaster’s Lifetime Limited Warranty for long-term confidence

Product Specifications

  • Brand: Flowmaster
  • Part Number: 817588
  • Product Type: Axle-back Exhaust System
  • Exhaust Series: American Thunder
  • Vehicle Drive Type: 2WD
  • Engine Compatibility: 5.0L V8
  • Material: 409 Stainless Steel Exhaust Tubing and Muffler Bodies
  • Exhaust Tip Material: 304 Stainless Steel
  • Exhaust Tip Finish: Polished Stainless Steel
  • Exhaust Tip Color: Silver
  • Exhaust Tip Diameter: 4.00 inches
  • Exhaust Tip Length: 5.25 inches
  • Exhaust Tip Quantity: 2
  • Tail Pipe Outlet Diameter: 3.00 inches
  • Main Piping Diameter: 3.00 inches
  • Exit Style: Dual Rear Exit
  • Muffler Quantity: 2
  • Muffler Series: Super 44 Series
  • Muffler Type: Chambered
  • Muffler Body Shape: Oval
  • Muffler Body Size: 13.00 inches long x 9.50 inches wide x 4.00 inches high
  • Muffler Finish: Black High-Temperature Paint Finish
  • Sound Level: Aggressive
  • Clamping Type: Flat Band
  • Clamps Included: Yes
  • Hangers Included: Yes
  • Catalytic Converter Included: No
  • Emission Code: 5
  • CARB Compliant: Yes
  • UPC: 700042027576

Install Difficulty level

This Flowmaster American Thunder Axle-back Exhaust System is designed for an easy bolt-on installation and uses factory hanger locations, making it a beginner-friendly exhaust upgrade. Installation can typically be completed in approximately 1 hour with basic hand tools and proper vehicle support equipment.

Vehicle Fitment

2013-2014 Ford Mustang GT 5.0L V8 Coupe and Convertible models.

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

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.
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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.
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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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