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Vehicle Info NeededFLOWMASTERPART NUMBER: 389-818139
818139 Outlaw Cat-Back Exhaust System Fits Select Toyota Tundra 3.4L
$1,59995
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Lowest Price GuaranteeToyota
Outlaw Cat-Back Exhaust SystemFits Select Toyota Tundra 3.4L 2.5 in. Tubing Dual Out Rear or Side Exit Outlaw Series Muffler 3.50 in. Black Ceramic-Coated Tips Aggressive Exterior Sound Stainless Steel Natural Finish
Flowmaster 389-818139 Features:
Flowmaster’s Outlaw Cat-Back Exhaust System is built for Toyota Tundra trucks equipped with the 3.4L engine, including hybrid models. Constructed from durable mandrel-bent 409 stainless steel, this system is designed to improve exhaust flow, increase performance, and deliver an aggressive exterior tone. The specially tuned Outlaw muffler sharpens engine sound while maintaining minimal interior resonance for a more enjoyable driving experience. Dyno testing shows gains of up to 10 hp and 14 lb-ft of torque at the rear wheels compared to the stock exhaust system. Dual 3.5 in. black ceramic-coated tips offer two configuration options—dual out the rear or dual out the side—allowing you to tailor both appearance and sound. Installation is straightforward thanks to the use of factory hanger locations, included hardware, and clear instructions. Backed by Flowmaster’s Lifetime Limited Warranty.- Custom-tuned Outlaw muffler delivers a more aggressive exhaust tone with improved flow and performance
- Dual-exit design offers flexibility to install the system with rear-exit or side-exit configurations
- 3.5 in. black ceramic-coated tips provide a bold, aggressive visual upgrade
- Aggressive exterior sound paired with minimal interior resonance for a balanced performance tone
- Tuned muffler and mandrel-bent design produce dyno-proven gains of 10 hp and 14 lb-ft of torque over the stock system
Part TypeExhaust System
BrandFLOWMASTER
Package Height15.25
Package Width16.0
Package Length63.5
Weight85.0 PG
Tailpipe Diameter (In.)2.5
Muffler Inlet Inside Diameter2.50 in.
Hangers IncludedYes
Main Piping Diameter2.50 in.
Tail Pipe QuantityDual
Inlet TypeFlanged
Exhaust Tip Material304 Stainless Steel
Catalytic Converter Quantity0
Exit LocationDual Out Rear or Dual Out Side
Inlet QuantityOne
Muffler Body Length24.50 in.
Sound LevelAggressive
Muffler Body Material409 Stainless Steel
Exhaust Tip CutAngled
Gasket Or Seal IncludedNo
Exhaust Tip IntercooledNo
Pipe ColorSilver
System FinishNatural
Muffler Quantity1
Muffler Inlet Outside Diameter2.63 in.
Exit QuantityDual
Muffler Flanged OutletNo
Tip Quantity2
Exhaust Tip ResonatedNo
Muffler Outlet LocationDual
Exhaust TypeCat-Back
Catalytic Converter IncludedNo
Part CategoryPerformance Parts
Hardware IncludedYes
Exhaust Tip WallDouble Wall
Exhaust Tip Quantity2
Muffler Inlet LocationDual
Exhaust Tip FinishBlack Ceramic Coating
Exhaust Tip EdgeAngle Cut
Valve IncludedNo
Muffler TypeReflection
Pipe Material409 Stainless Steel
Muffler Body Width10 in.
Tail Pipe Tapered OutletNo
Muffler Body ShapeOval
Mounting Bracket IncludedYes
Muffler Outlet Quantity2
Muffler FinishBlack High-Temperature Paint Finish
Mount TypeUses factory hangers
Clamps IncludedYes
Muffler StyleOutlaw Series
FinishNatural
Exit StyleDual Out Rear
Muffler Body Height5 in.
Tip IncludedYes
Clamping TypeFlat Band
Muffler Flanged InletNo
Spring Bolt Kit IncludedNo
Muffler SeriesOutlaw
QuantitySold as a Kit
Muffler IncludedYes
Exhaust Tip ConnectionClamp-On
System StyleCat-Back
Tail Pipe Outlet Outside Diameter2.50 in.
Muffler ConfigurationSingle inlet/Dual outlet
System Material409 Stainless Steel
Valve TypeNot Applicable
Intermediate Pipe Diameter2.5 in (63.5 mm)
Exhaust Tip Diameter3.50 in.
Part FitmentDirect Fit
Vendor Part Number818139
Package Qty1
Package TypeEA
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