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24-26 Ford Mustang GT 5.0L V8 / 2.3L V6 Flowmaster 818164 Outlaw Axle-Back Exhaust System

The Flowmaster Outlaw Axle-Back Exhaust System (818164) delivers an aggressive exhaust tone, improved exhaust flow, and dyno-proven gains of up to 17 horsepower and 17 lb-ft of torque. Featuring durable 409 stainless steel construction, polished quad 4-inch tips, and factory-style valve compatibility, this direct-fit system installs easily using factory mounting locations.

Top Features

  • Up to 17 HP and 17 lb-ft torque gains at the rear wheels.
  • Aggressive Flowmaster Outlaw exhaust tone.
  • 3.00-inch mandrel-bent 16-gauge 409 stainless steel tubing.
  • Quad 4.00-inch polished 304 stainless steel exhaust tips.
  • Retains OEM-style active exhaust valves using factory actuators.
  • Direct-fit design using factory hanger locations.
  • Installation hardware and clamps included.
  • Fits coupe and convertible models.
  • Backed by Flowmaster's Lifetime Limited Warranty.

Vehicle Fitment

  • 2024-2026 Ford Mustang GT 5.0L V8 with Factory Active Performance Exhaust
  • 2024-2026 Ford Mustang EcoBoost 2.3L with Factory Active Performance Exhaust
  • Fits Coupe and Convertible models.
Vendor: Flowmaster
SKU: FLO818164
Availability: 8 In Stock
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UPC: 090127844274
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Description

Flowmaster Outlaw Axle-Back Exhaust System for 2024-2026 Ford Mustang GT 5.0L V8 / EcoBoost 2.3L - Part #818164

The Flowmaster Outlaw Axle-Back Exhaust System (Part #818164) is engineered for enthusiasts looking to enhance the performance, sound, and appearance of the 2024-2026 Ford Mustang equipped with the factory Active Performance Exhaust system. Designed for both the 5.0L GT V8 and EcoBoost 2.3L models, this premium axle-back system delivers the unmistakable aggressive Outlaw exhaust tone while improving exhaust flow for increased performance. Dyno testing measured maximum gains of up to 17 horsepower and 17 lb-ft of torque at the rear wheels over the factory exhaust. Constructed from durable 3.00-inch mandrel-bent 16-gauge 409 stainless steel tubing and finished with quad 4.00-inch polished 304 stainless steel tips, this system combines long-lasting durability with an aggressive, custom appearance. The factory-style valves are retained by reusing the OEM valve actuators, while factory hanger locations and included installation hardware simplify installation. Designed to fit both coupe and convertible models, this performance exhaust is backed by Flowmaster's Lifetime Limited Warranty for lasting confidence.

Key Features

  • Flowmaster Outlaw Axle-Back Exhaust System.
  • Part Number: 818164.
  • Designed for vehicles equipped with the factory Active Performance Exhaust option.
  • Maximum dyno gains of up to 17 horsepower and 17 lb-ft of torque at the rear wheels.
  • Outlaw Series reflection-style performance mufflers produce an aggressive exhaust tone.
  • 3.00-inch mandrel-bent 16-gauge 409 stainless steel tubing improves exhaust flow.
  • Dual rear exit with quad 4.00-inch polished 304 stainless steel exhaust tips.
  • OEM-style exhaust valves included; reuses factory valve actuators.
  • Uses factory hanger locations for a direct-fit installation.
  • Includes required clamps and installation hardware.
  • Fits both coupe and convertible body styles.
  • Lifetime Limited Warranty.

Benefits

  • Delivers a deep, aggressive exhaust note synonymous with the Flowmaster Outlaw Series.
  • Improves exhaust flow to help maximize horsepower and torque.
  • Provides a premium performance appearance with polished quad stainless steel tips.
  • 409 stainless steel construction offers excellent durability and long-term corrosion resistance.
  • Maintains factory active exhaust functionality by utilizing OEM-style valves.
  • Direct-fit design minimizes installation complexity by using factory mounting locations.
  • Backed by Flowmaster's Lifetime Limited Warranty for long-term ownership confidence.

Product Specifications

  • Brand: Flowmaster
  • Part Number: 818164
  • Product Type: Axle-Back Exhaust System
  • Exhaust Series: Outlaw
  • Sound Level: Aggressive
  • Main Pipe Diameter: 3.00 inches
  • Pipe Material: 409 Stainless Steel
  • Pipe Color: Silver
  • Pipe Construction: 16-gauge mandrel bent
  • Muffler Series: Outlaw
  • Muffler Type: Reflection
  • Muffler Material: 409 Stainless Steel
  • Muffler Finish: Black high-temperature paint
  • Muffler Shape: Round
  • Muffler Dimensions: 6.50 in. length x 4.00 in. width x 4.00 in. height
  • Muffler Quantity: 2
  • 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 Shape: Round
  • Exhaust Tip Style: Double-wall, angle-cut, welded
  • Tip Logo: Embossed
  • Exit Style: Dual Rear Exit
  • Tail Pipe Quantity: 2
  • Clamping Type: Flat Band
  • Clamps Included: Yes
  • Hangers Included: Yes
  • Mount Type: Uses Factory Hangers
  • Valve Included: Yes
  • Valve Type: OEM-Style Valves
  • Valve Actuator: Reuse OEM Actuators
  • Catalytic Converters Included: No
  • California Proposition 65: Yes
  • CARB Compliant: Yes

Install Difficulty Level

Difficulty: Easy to Moderate.

This direct-fit axle-back exhaust is designed to utilize the factory hanger locations and includes the necessary installation hardware for a straightforward installation. The OEM active exhaust valve actuators are transferred to the new exhaust assemblies to retain factory functionality. The shortest published installation time is approximately 1 hour for an experienced installer.

Vehicle Fitment

  • 2024 Ford Mustang GT 5.0L V8 with Factory Active Performance Exhaust - Coupe and Convertible
  • 2024 Ford Mustang EcoBoost 2.3L with Factory Active Performance Exhaust - Coupe and Convertible
  • 2025 Ford Mustang GT 5.0L V8 with Factory Active Performance Exhaust - Coupe and Convertible
  • 2025 Ford Mustang EcoBoost 2.3L with Factory Active Performance Exhaust - Coupe and Convertible
  • 2026 Ford Mustang GT 5.0L V8 with Factory Active Performance Exhaust - Coupe and Convertible
  • 2026 Ford Mustang EcoBoost 2.3L with Factory Active Performance Exhaust - Coupe and Convertible

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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