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Vehicle Info NeededFLOWMASTERPART NUMBER: 389-818118
Outlaw Extreme Series Cat-Back Exhaust System Fits Select Ford F-150 Trucks 2.7L, 3.5L, 5.0L
$58495
Ships on Sep 04, 2026
Lowest Price GuaranteeFord
Outlaw Extreme Series Cat-Back Exhaust SystemFits Select Ford F-150 Trucks 2.7L, 3.5L, 5.0L 409S Stainless Steel 3 in. Tubing Underbody Dump Style Exhaust Sold as a Kit
Flowmaster 818118 Features:
- +7 Horsepower and +10 ft./lbs. of torque
- Powerful deep sound inside & outside the vehicle
- Dump style exhaust tip after the muffler eliminates over-the-axle routing
- Greatly improved ground clearance and departure angle for serious off-roading
- Attaches with included hardware to factory hangar locations for easy install
Fitment Note: Does not fit Raptor models.
Emissions: This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.
Part TypeExhaust System
BrandFLOWMASTER
Package Height14.0
Package Width14.5
Package Length48.75
Weight18.75 PG
Muffler Body Diameter4 in.
Tailpipe Diameter (In.)3
Muffler Inlet Inside Diameter3 in.
Hangers IncludedYes
Main Piping Diameter3 in.
Tail Pipe QuantitySingle
Inlet TypeFlanged
Inlet Size (In.)3
Tip CutStraight
Catalytic Converter Quantity0
Exit LocationUnderbody
Torque Increase+10 ft./lbs. @ 4710 RPM
Muffler Body Length10.50 in.
Sound LevelAggressive
Tube Diameter3 in (76.2 mm)
Muffler Body Material409 Stainless Steel
Hanger IncludedYes
Exhaust Tip CutTurndown
Gasket Or Seal IncludedNo
Exhaust Tip IntercooledNo
Pipe ColorSilver
California Air Board ApprovedYes
Muffler Quantity1
Muffler Inlet Outside Diameter3.13 in.
Exit QuantityOne
Muffler Flanged OutletNo
Muffler Outlet LocationCenter
Catalytic Converter IncludedNo
Part CategoryPerformance Parts
Hardware IncludedYes
Exhaust Tip Quantity0
Muffler Inlet LocationCenter
Exhaust Tip EdgeCut
Valve IncludedNo
Muffler TypeReflection
Pipe Material409 Stainless Steel
Muffler Body Width4 in.
Tail Pipe Tapered OutletNo
Gauge16
Muffler Body ShapeRound
Mounting Bracket IncludedNo
Muffler Outlet Quantity1
Muffler FinishBlack High-Temperature Paint Finish
Mount TypeUses Factory Hangers
Inlet Diameter3 in.
Clamps IncludedYes
Horse Power Increase+7 HP @ 4710 RPM
FinishNatural
Exit StyleSingle Out Dump
Muffler Body Height4 in.
Clamping TypeFlat Band
Muffler Flanged InletNo
Mandrel-BentYes
Spring Bolt Kit IncludedNo
Muffler SeriesOutlaw
QuantitySold as a kit
Muffler IncludedYes
System StyleCat-back
Tail Pipe Outlet Outside Diameter3 in.
Muffler ConfigurationCenter/Center
System Material409S Stainless Steel
Valve TypeNot Applicable
Tip ShapeRound
Exhaust Tip Diameter3 in.
Part FitmentDirect Fit
Package Qty1
Package TypeEA
No Questions
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Some parts are not legal for use in California or other states with similar laws / regulations
