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18-23 Ford Mustang GT 5.0L V8 Flowmaster 817825 Outlaw Axle-back Exhaust System

The Flowmaster 817825 Outlaw Axle-Back Exhaust System delivers an aggressive exhaust tone and performance-inspired styling for 2018-2023 Ford Mustang GT 5.0L models with Factory Active Performance Exhaust Valves. Featuring Outlaw Series mufflers, 409 stainless steel construction, and polished quad tips, this system enhances sound, appearance, and durability.

Top Features

  • Designed for Ford Mustang GT 5.0L models with Factory Active Performance Exhaust Valves.
  • Race-proven Outlaw Series mufflers provide an aggressive exhaust sound.
  • 3.00-inch mandrel-bent 409 stainless steel tubing supports high-flow performance.
  • Polished quad 4.00-inch 304 stainless steel tips create a bold rear appearance.
  • OEM-style exhaust valves allow reuse of factory exhaust actuators.
  • Straight-through muffler design helps maximize exhaust flow.
  • Uses factory hanger locations for an easy installation.
  • Includes clamps, hardware, and installation instructions.
  • Covered by Flowmaster's Lifetime Limited Warranty.

Vehicle Fitment

  • 2018-2023 Ford Mustang GT Coupe
  • 2018-2023 Ford Mustang GT Convertible
  • Engine: 5.0L V8
  • Requires Factory Active Performance Exhaust Valves
Vendor: Flowmaster
SKU: FLO817825
Availability: 28 In Stock
$ 1,599.95 USD
On-Sale $ 1,599.95 USD
Normally $ 1,599.95 USD
Save $ 0.00
Better hurry, only 28 left in stock.

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UPC: 700042038213
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Proposition65 Warning: Cancer and Reproductive Harm

Flowmaster 817825 Outlaw Axle-Back Exhaust System

The Flowmaster 817825 Outlaw Axle-Back Exhaust System is engineered for 2018-2023 Ford Mustang GT 5.0L models equipped with the Factory Active Performance Exhaust Valves. Designed for enthusiasts seeking an aggressive exhaust tone and performance-inspired appearance, this system features race-proven Outlaw Series mufflers, high-flow 409S stainless steel tubing, and polished quad exhaust tips for a bold upgrade that enhances the look and sound of the Mustang GT. The axle-back design uses factory hanger locations and includes components required for an easy at-home installation while maintaining compatibility with the factory exhaust actuators.

Key Features

  • Specifically designed for 2018-2023 Ford Mustang GT 5.0L coupes and convertibles with Factory Active Performance Exhaust Valves.
  • Race-proven Flowmaster Outlaw Series mufflers deliver an aggressive exterior sound level with a noticeable interior tone.
  • Includes OEM-style exhaust valves to reuse the factory exhaust actuators.
  • Large 3.00-inch mandrel-bent 409S stainless steel tubing supports high exhaust flow and long-term durability.
  • Polished quad 4.00-inch 304 stainless steel tips provide an aggressive, performance-focused appearance.
  • Dyno-tuned for maximum performance.
  • Straight-through muffler design promotes efficient exhaust flow.
  • Uses factory hanger locations for a straightforward installation.
  • Full stainless steel construction provides strength and corrosion resistance.

Benefits

  • Provides a bold, aggressive exhaust note designed to complement the Mustang GT 5.0L performance character.
  • Enhances the rear appearance of the vehicle with large polished quad exhaust tips.
  • Maintains factory-style valve functionality by using OEM-style valves with factory exhaust actuators.
  • Offers durable performance construction with stainless steel components built for long-lasting use.
  • Includes all necessary parts, hardware, and detailed instructions for a convenient installation experience.
  • Backed by Flowmaster's Lifetime Limited Warranty.

Product Specifications

  • Brand: Flowmaster
  • Product Type: Axle-Back Exhaust System
  • Exhaust Series: Outlaw
  • Part Type: Exhaust System
  • Material: 409 Stainless Steel tubing and muffler construction
  • Exhaust Tip Material: 304 Stainless Steel
  • Exhaust Tip Finish: Polished
  • Exhaust Tip Color: Silver
  • Exhaust Tip Quantity: 4
  • Exhaust Tip Diameter: 4.00 inches
  • Exhaust Tip Length: 5.25 inches
  • Exhaust Tip Shape: Round
  • Exhaust Tip Style: Angled cut with double wall construction
  • Main Piping Diameter: 3.00 inches
  • Muffler Quantity: 2
  • Muffler Series: Outlaw
  • Muffler Type: Reflection
  • Muffler Body Material: 409 Stainless Steel
  • Muffler Finish: Black high-temperature paint finish
  • Muffler Color: Black
  • Muffler Body Shape: Round
  • Muffler Overall Length: 49.50 inches
  • Valve Type: OEM-style valves
  • Valve Actuator: Not included; reuse OEM actuator
  • Clamp Type: Flat Band
  • Clamps Included: Yes
  • Hangers Included: Yes
  • Mount Type: Uses factory hangers
  • Finish: Natural
  • Sound Level: Aggressive
  • Catalytic Converter Included: No
  • California Proposition 65: Yes

Install Difficulty Level

Easy installation. The Flowmaster 817825 Outlaw Axle-Back Exhaust System is designed to use factory hanger locations and includes the required parts, hardware, and detailed instructions to support a convenient installation that can be completed at home.

Vehicle Fitment

2018-2023 Ford Mustang GT Coupe and Convertible with 5.0L V8 engine and Factory Active Performance Exhaust Valves.

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.
  • 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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