Flowmaster - flo818171 - Outlaw Direct-Fit Muffler System

This Flowmaster® Outlaw Direct-Fit Muffler system for the 2021-2026 Ford F-150 trucks with the 2.7, 3.5 or 5.0-liter engines is manufactured using durable 409 stainless steel throughout and features 3.00-inch mandrel bent pipes for optimum exhaust gas flow. A Flowmaster Outlaw Series muffler is used for an aggressive sound level and maximum performance. Performance increases on the dyno revealed an increase of 16 hp and 21 ft/lbs. at the rear wheels. This system connects directly to the factory dual tail pipes and uses all the existing factory hangers. Includes installation instructions and all necessary hardware for an easy installation that you can do at home. Backed by Flowmaster's Lifetime Limited Warranty. Fits 2021-2026 Ford F-150 with 2.7, 3.5 and 5.0-liter non-PowerBoost engines with factory dual tailpipes This system replaces ONLY the Factory muffler and over axle pipes and reuses the factory dual tail pipes and tips. Does not fit PowerBoost hybrid models. Does not fit models with OEM active exhaust option.

• Powerful exhaust note with an aggressive sound level that’s a perfect balance of sound and power
• Connects directly to the factory dual tailpipes for a simple installation
• Flowmaster Outlaw series muffler offers race proven performance
• Large 3.0-inch Mandrel bent pipes for superior flow and power
• Max power gains of 16 hp and 21 lb-ft at the rear wheels
• 409 stainless steel constuction for extra durability
• Lifetime limited Warranty

The Flowmaster Outlaw Direct-Fit Muffler System is designed for 2021–2026 Ford F-150 trucks equipped with 2.7L, 3.5L, or 5.0L non-PowerBoost engines and factory dual tailpipes. It replaces the factory muffler and over-axle pipes while reusing the original dual tailpipes, tips, and hangers. The system provides an aggressive exhaust note and is engineered for improved exhaust flow and performance.

Constructed from 409 stainless steel, the system uses 3.00-inch mandrel-bent pipes and a Flowmaster Outlaw Series muffler. Dyno testing showed gains of up to 16 horsepower and 21 lb.-ft. of torque at the rear wheels. Direct connection to the factory dual tailpipes supports a straightforward installation using the existing factory hangers.

Key Features & Performance Benefits

• Aggressive exhaust sound: Delivers a powerful exhaust note balanced with performance.
• Improved exhaust flow: Large 3.00-inch mandrel-bent pipes support efficient gas flow.
• Dyno-tested performance: Produced gains of up to 16 horsepower and 21 lb.-ft. at the rear wheels.
• Direct-fit installation: Connects to the factory dual tailpipes and reuses the existing factory hangers.

Key Product Specifications & Technical Data

• Brand: Flowmaster
• Part Number: flo818171
• Product Type: Outlaw Direct-Fit Muffler System
• Vehicle Application: 2021–2026 Ford F-150
• Engine Applications: 2.7L, 3.5L, and 5.0L non-PowerBoost engines
• Pipe Diameter: 3.00 inches
• Material: 409 stainless steel
• Muffler: Flowmaster Outlaw Series

What's Included

The system includes the direct-fit muffler and over-axle pipe assembly, installation instructions, and necessary installation hardware. It reuses the factory dual tailpipes, tips, and hangers. Does not fit PowerBoost hybrid models or vehicles equipped with the OEM active exhaust option.

Fitments:
2021 Ford F-150 King Ranch
2021 Ford F-150 Lariat
2021 Ford F-150 Limited
2021 Ford F-150 Platinum
2021 Ford F-150 Police Responder
2021 Ford F-150 SSV
2021 Ford F-150 Tremor
2021 Ford F-150 XL
2021 Ford F-150 XLT
2022 Ford F-150 King Ranch
2022 Ford F-150 Lariat
2022 Ford F-150 Limited
2022 Ford F-150 Platinum
2022 Ford F-150 Police Responder
2022 Ford F-150 SSV
2022 Ford F-150 Tremor
2022 Ford F-150 XL
2022 Ford F-150 XLT
2023 Ford F-150 King Ranch
2023 Ford F-150 Lariat
2023 Ford F-150 Limited
2023 Ford F-150 Platinum
2023 Ford F-150 Police Responder
2023 Ford F-150 SSV
2023 Ford F-150 Tremor
2023 Ford F-150 XL
2023 Ford F-150 XLT
2024 Ford F-150 King Ranch
2024 Ford F-150 Lariat
2024 Ford F-150 Platinum
2024 Ford F-150 Police Responder
2024 Ford F-150 SSV
2024 Ford F-150 STX
2024 Ford F-150 Tremor
2024 Ford F-150 XL
2024 Ford F-150 XLT
2025 Ford F-150 King Ranch
2025 Ford F-150 Lariat
2025 Ford F-150 Platinum
2025 Ford F-150 Police Responder
2025 Ford F-150 SSV
2025 Ford F-150 STX
2025 Ford F-150 Tremor
2025 Ford F-150 XL
2025 Ford F-150 XLT
2026 Ford F-150 King Ranch
2026 Ford F-150 Lariat
2026 Ford F-150 Platinum
2026 Ford F-150 Police Responder
2026 Ford F-150 SSV
2026 Ford F-150 STX
2026 Ford F-150 Tremor
2026 Ford F-150 XL
2026 Ford F-150 XLT

Air Freight Prohibited: false
Not Carb Approved: false
Carb Acknowledgement Required: false
Ltl Freight Required: false
Prop 65: Y
Part Type: automotive
Epa: N/A
Units Per Sku: 1
Regular Stock: t