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21-26 Ford F-150 2.7L/3.5L/5.0L Flowmaster 818118 Outlaw Extreme Cat-Back Exhaust System

The Flowmaster 818118 Outlaw Extreme Cat-Back Exhaust System upgrades 2021-2026 Ford F-150 trucks with an aggressive exhaust tone, improved flow, and durable 409 stainless steel construction. Designed for performance and off-road capability, this system features a dump-style exit for increased ground clearance and easy factory-hanger installation.

Top Features

  • Outlaw Extreme performance muffler delivers a deep, powerful, aggressive exhaust sound.
  • 3.0-inch 16-gauge mandrel bent 409 stainless steel tubing maximizes exhaust flow and durability.
  • Dump-style single-out exit design removes the over-axle tailpipe for improved ground clearance.
  • Provides maximum dyno gains of 7 HP and 10 LB.FT torque over stock at the rear wheels.
  • Uses factory hanger locations for a direct-fit installation.
  • Includes required hardware for installation.
  • Backed by Flowmaster's Lifetime Limited Warranty.

Vehicle Fitment

  • 2021-2026 Ford F-150 with 2.7L engine.
  • 2021-2026 Ford F-150 with 3.5L EcoBoost engine.
  • 2021-2026 Ford F-150 with 5.0L engine.
  • Fits 2-wheel drive and 4-wheel drive models.
  • Does not fit Raptor models, standard cab 6.5-foot bed models (122-inch wheelbase), Hybrid PowerBoost models, or models equipped with OEM active exhaust.
Vendor: Flowmaster
SKU: FLO818118
Availability: 2 In Stock
$ 584.95 USD
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Normally $ 584.95 USD
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UPC: 090127130056
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Proposition65 Warning: Cancer and Reproductive Harm

21-26 Ford F-150 2.7L/3.5L/5.0L Flowmaster 818118 Outlaw Extreme Cat-Back Exhaust System

The Flowmaster 818118 Outlaw Extreme Cat-Back Exhaust System is designed for 2021-2026 Ford F-150 trucks equipped with the 2.7L, 3.5L, or 5.0L engine. This high-performance exhaust system delivers an aggressive, deep exhaust tone while improving exhaust flow and durability. Featuring a 3.0-inch mandrel bent 409 stainless steel construction, the system is engineered to provide long-term corrosion resistance and maximum performance. The Outlaw Extreme design uses a dump-style exit directly after the muffler, eliminating the over-axle tailpipe to improve ground clearance and departure angle for demanding off-road conditions. With factory hanger locations, included hardware, and a performance-focused design, this cat-back exhaust system provides an excellent upgrade for F-150 owners seeking enhanced sound, durability, and off-road capability.

Key Features

  • Outlaw series performance muffler provides a deep, powerful exhaust sound and increased performance.
  • 3.0-inch 16-gauge mandrel bent 409 stainless steel tubing helps maintain maximum exhaust flow.
  • 409 stainless steel construction provides added durability and improved long-term corrosion resistance.
  • Dump-style exit design eliminates the over-axle tailpipe for improved ground clearance.
  • Uses factory hanger locations for a straightforward installation.
  • Includes all necessary hardware for an at-home installation.
  • Dyno testing shows maximum gains of 7 HP and 10 LB.FT torque over stock at the rear wheels.

Benefits

  • Creates an aggressive exhaust tone that enhances the driving experience.
  • Improves exhaust flow for performance-oriented truck applications.
  • Provides increased durability for long-term use in demanding conditions.
  • Helps improve off-road clearance and departure angle by removing the over-axle tailpipe.
  • Designed for easier installation using factory mounting locations.
  • Backed by Flowmaster's Lifetime Limited Warranty for added confidence.

Product Specifications

  • Brand: Flowmaster
  • Part Number: 818118
  • Product Type: Cat-Back Exhaust System
  • Exhaust Series: Outlaw Extreme
  • Category: Exhaust
  • Grade Type: Performance
  • Material: 409 Stainless Steel
  • Pipe Material: 409 Stainless Steel
  • Pipe Color: Silver
  • Finish: Natural
  • Main Piping Diameter: 3.00 inches
  • Inlet Diameter: 3.00 inches
  • Outlet Diameter: 3.00 inches
  • Exhaust Tip Diameter: 3.00 inches
  • Exhaust Tip Shape: Round
  • Exhaust Tip Cut: Turndown
  • Exit Style: Single Out Dump
  • Tail Pipe Quantity: 1
  • Muffler Included: Yes
  • Muffler Series: Outlaw
  • Muffler Type: Reflection
  • Muffler Material: 409 Stainless Steel
  • Muffler Color: Black
  • Muffler Finish: Black High-Temperature Paint Finish
  • Muffler Body Dimensions: 4.00-inch height x 4.00-inch width x 10.50-inch length
  • Muffler Overall Length: 44.10 inches
  • Clamps Included: Yes
  • Clamping Type: Flat Band
  • Hangers Included: Yes
  • Mount Type: Uses factory hangers
  • Catalytic Converter Included: No
  • Sound Level: Aggressive
  • California Proposition 65: Yes
  • Emission Code: 5

Install Difficulty Level

This Flowmaster Outlaw Extreme Cat-Back Exhaust System is designed for a simple installation process using factory hanger locations. The included hardware and direct-fit design help make installation manageable for experienced DIY enthusiasts and professional installers.

Vehicle Fitment

Fits 2021-2026 Ford F-150 trucks with 2.7L, 3.5L EcoBoost, and 5.0L engines. Compatible with 2-wheel drive and 4-wheel drive models. Does not fit Raptor models, standard cab models with 6.5-foot bed (122-inch wheelbase), hybrid PowerBoost models, or models equipped with the OEM active 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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