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24-26 Ford Mustang GT 5.0L V8 / 2.3L EB V6 Flowmaster 818159 Outlaw Axle-Back Exhaust System

The Flowmaster Outlaw Axle-Back Exhaust System 818159 upgrades the 2024-2026 Ford Mustang with an aggressive exhaust tone, improved airflow, and a custom appearance. Featuring 3.00-inch 409 stainless steel tubing, Outlaw reflection mufflers, and black ceramic quad tips, this system delivers performance styling with durable construction and easy factory-style installation.

Top Features

  • Outlaw series reflection mufflers deliver a deep, aggressive performance exhaust sound.
  • Maximum dyno gains of up to 17 horsepower and 17 lb-ft of torque at the rear wheels.
  • 3.00-inch mandrel bent 409 stainless steel tubing helps maximize exhaust flow and durability.
  • Quad 4.00-inch black ceramic coated stainless steel tips provide a custom high-performance look.
  • OEM-style valves included with reuse of the factory valve actuator.
  • Uses factory hanger locations for a simple installation process.
  • Includes necessary installation hardware.
  • Backed by Flowmaster's Lifetime Limited Warranty.

Vehicle Fitment

  • 2024-2026 Ford Mustang GT Coupe and Convertible with 5.0L V8 engine and factory performance exhaust option.
  • 2024-2026 Ford Mustang EcoBoost Coupe and Convertible with 2.3L engine and factory performance exhaust option.
Vendor: Flowmaster
SKU: FLO818159
Availability: 26 In Stock
$ 1,749.95 USD
On-Sale $ 1,749.95 USD
Normally $ 1,749.95 USD
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UPC: 090127843833
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Proposition65 Warning: Cancer and Reproductive Harm

Flowmaster Outlaw Axle-Back Exhaust System

Part Number: 818159

The Flowmaster Outlaw Axle-Back Exhaust System 818159 is designed for 2024-2026 Ford Mustang GT 5.0L and EcoBoost 2.3L models equipped with the factory performance exhaust option. This performance exhaust upgrade delivers an aggressive Outlaw exhaust tone, improved exhaust flow, and a custom appearance with quad 4.00-inch black ceramic coated tips. The system uses Flowmaster Outlaw reflection mufflers and durable 3.00-inch mandrel bent 409 stainless steel tubing to help maximize airflow and provide long-lasting corrosion resistance. Dyno testing measured maximum gains of up to 17 horsepower and 17 lb-ft of torque at the rear wheels over the stock exhaust. Designed for both coupe and convertible Mustang applications, this axle-back system includes the required hardware and uses factory hanger locations for a streamlined installation.

Key Features

  • Flowmaster Outlaw series performance mufflers provide an aggressive, deep, powerful exhaust sound.
  • Maximum measured gains of up to 17 horsepower and 17 lb-ft of torque over the stock exhaust at the rear wheels.
  • 3.00-inch 16-gauge mandrel bent 409 stainless steel tubing helps maintain maximum exhaust flow for improved performance.
  • Quad 4.00-inch black ceramic coated stainless steel tips create a custom high-performance appearance.
  • OEM-style valves are included and reuse the factory valve actuator.
  • Uses factory hanger locations for easier installation and proper fitment.
  • Includes necessary installation hardware for a convenient upgrade.

Benefits

  • Enhances the Mustang driving experience with a bold and aggressive performance exhaust tone.
  • Improves exhaust flow while maintaining durable construction for long-term performance.
  • Adds a customized rear appearance with black ceramic coated quad exhaust tips.
  • Provides a performance-focused axle-back upgrade without replacing the entire exhaust system.
  • Built with quality materials and backed by Flowmaster's Lifetime Limited Warranty for added confidence.

Product Specifications

  • Brand: Flowmaster
  • Part Number: 818159
  • Product Type: Axle-Back Exhaust System
  • Exhaust Series: Outlaw
  • Sound Level: Aggressive
  • Main Piping Diameter: 3.00 inches
  • Piping Material: 409 Stainless Steel
  • Pipe Color: Silver
  • Exhaust Tip Diameter: 4.00 inches
  • Exhaust Tip Material: 304 Stainless Steel
  • Exhaust Tip Finish: Black Ceramic Coating
  • Exhaust Tip Shape: Round
  • Exhaust Tip Cut: Angled
  • Exhaust Tip Length: 5.25 inches
  • Exhaust Tip Quantity: 2
  • Exhaust Exit Style: Dual Out Rear
  • Muffler Type: Reflection
  • Muffler Quantity: 2
  • Muffler Material: 409 Stainless Steel
  • Muffler Finish: Black High-Temperature Paint Finish
  • Muffler Dimensions: 4.00-inch height x 4.00-inch width x 6.50-inch length
  • Mount Type: Uses factory hangers
  • Clamping Type: Flat Band
  • Valve Type: OEM-Style Valves
  • Valve Included: Yes
  • Catalytic Converter Included: No
  • California Proposition 65: Yes
  • Emission Code: 5

Install Difficulty Level

This Flowmaster Outlaw Axle-Back Exhaust System is designed for a straightforward installation using factory mounting locations and included hardware. The installation difficulty is considered simple, with an approximate installation time of 2 hours when proper tools and equipment are available. :contentReference[oaicite:0]{index=0}

Vehicle Fitment

  • 2024-2026 Ford Mustang GT Coupe and Convertible with 5.0L V8 engine and factory performance exhaust option
  • 2024-2026 Ford Mustang EcoBoost Coupe and Convertible with 2.3L engine and factory performance exhaust option

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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