Product Summary

Direct-Fit Muffler Exhaust System Type, Natural

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

MFG. Part #818171
BrandFlowmaster
Exhaust System TypeDirect-Fit Muffler
Exhaust Tubing Diameter3 Inch
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Flowmaster 818171 Details


This Flowmaster® Outlaw Direct-Fit Muffler system for the 2021-2024 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.
  • Large 3.0-inch Mandrel bent pipes for superior flow and power
  • Flowmaster Outlaw series muffler offers race proven performance
  • Powerful exhaust note with an aggressive sound level that’s a perfect balance of sound and power
  • Max power gains of 16 hp and 21 lb-ft at the rear wheels
  • 409 stainless steel constuction for extra durability
  • Connects directly to the factory dual tailpipes for a simple installation
  • Lifetime limited Warranty

    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.

  • CARB Warning

    For use on pre-1966 vehicles only

    Emissions warning: this part only legal for sale or use in California if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. ++any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering there are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

    Flowmaster 818171 Specifications

    KEY SPECS
    MFG. Part #818171
    BrandFlowmaster
    Exhaust System TypeDirect-Fit Muffler
    Exhaust Tubing Diameter3 Inch
    GENERAL
    Muffler Quantity1
    Exhaust Tip Quantity0
    Exhaust System FinishNatural
    Muffler Body ShapeOval
    Muffler Inlet Diameter3"
    Muffler Outlet Diameter3"
    Muffler Overall Length12.2"
    Muffler Body Length6.5"
    Muffler FinishPainted
    Muffler ColorBlack
    Mount TypeUses Factory Hangers
    Sold in QuantityEach
    GTIN Code00090127846599
    Material Type409 Stainless Steel

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